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Run Dependabot pull requests on GitHub-hosted runners - #892
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Reviewer's GuideThe PR rolls out the established runner-selection pattern by adding Dependabot pull requests to the GitHub-hosted Linux runner arm, using the pull request author rather than the triggering actor, while retaining Ubicloud for pushes and strengthening the workflow contract and documentation. Flow diagram for Dependabot-aware runner selectionflowchart TD
Event[Pull request or push event] --> Guard{"Fork pull request or author is dependabot[bot]"}
Guard -->|Yes| Hosted[ubuntu-latest]
Guard -->|No| Ubicloud[ubicloud-standard-2]
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| Layer / File(s) | Summary |
|---|---|
Runner guard and validation .github/workflows/ci.yml, tests/workflow_contracts/runner_label_*, docs/developers-guide.md |
The Linux runner guard selects the hosted runner for fork or Dependabot-authored pull requests. Contract tests expect the shared guard. The guide explains the author check and that expression properties for other events are empty strings and falsy. |
Possibly related issues
- Unblock the Dependabot queue: four CI failures and an MSRV decision pg-embed-setup-unpriv#358: The issue requests hosted runners for Dependabot pull requests. This change implements that runner selection, but does not address the issue’s other failures.
Possibly related PRs
- leynos/wireframe#783: Adds the same fork-or-Dependabot author guard to runner selection, documentation, and workflow contracts.
- leynos/shared-actions#646: Applies the same fork-or-Dependabot rule to Ubicloud workflow runners and documents it.
- leynos/weaver#359: Adds the same Dependabot author condition and requires the combined guard in contract tests.
Suggested labels: Issue
Suggested reviewers: wafflecat-df12
Priority:
Change: Feature
Merge Risk: 
8adff
-
No actionable merge-blocking risk remains.
Caution
Pre-merge checks failed
Please resolve all errors before merging. Addressing warnings is optional.
- Ignore
| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Testing (Unit And Behavioural) |  |
The new tests verify only the textual shape of the YAML expression. test_linux_lane_falls_back_to_github_hosted_for_forks compares the parsed guard and its two labels, while the helper only parses s… |
Add behavioural tests that evaluate the declared selector against representative event contexts: Dependabot pull request, human internal pull request, fork pull request, push, and workflow dispatch. Add a workflow-level smoke test or equiva… |
| Developer Documentation |  |
The developer guide documents the Dependabot runner rule, but the relevant accepted ADR remains stale. The pull request changes .github/workflows/ci.yml to test `github.event.pull_request.user.login… |
Add a dated addendum to ADR 013. Record the combined fork-or-Dependabot expression, the author-based pull_request.user.login check, the unchanged Ubicloud path for pushes to main, and the cold-cache consequence. Keep the 2026-09-16 fork… |
| Observability | |
The pull request changes runner placement and cache behaviour. The Linux lane now sends Dependabot pull requests to ubuntu-latest, while the guide states that these runs build from a cold cache. The… |
Add bounded workflow observability at the runner-selection point. Report the selected runner environment, a non-sensitive route reason (fork, dependabot, internal-pr, or non-pr), cache hit or miss outcomes, and job duration in the l… |
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Check name Status Explanation Title check Confirm that the title clearly describes the main change: routing Dependabot pull requests to GitHub-hosted runners. No referenced GitHub issue or roadmap item requires an additional title identifier. Description check Confirm that the description directly explains the runner-selection change, affected tests, documentation, validation results, and rollout context. Docstring Coverage Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 2 files. (1 skipped: 1 … Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Testing (Overall) Pass this check. The contract reads the actual ci.ymlmatrix label and parses its guard and both result labels.runner_label_shape_test.py:62-88requires the combined fork-or-`pull_request.user.lo…User-Facing Documentation Pass. The change affects internal GitHub Actions runner placement for repository CI, not rstest-bddfunctionality used by library consumers. The pull request documents the runner behaviour in `docs/…Module-Level Documentation The pull request changes two Python modules, and both retain clear module-level docstrings. runner_label_shape_test.pystates its purpose, failure cases, and usage.runner_label_support.pystates …Testing (Property / Proof) PASS — The change adds a small boolean routing contract: fork status and Dependabot-author status produce four meaningful cases, including non-pull-request events. The complete table is easy to audit,… Testing (Compile-Time / Ui) PASS. The pull request changes GitHub Actions YAML, documentation, and Python workflow-contract tests. It introduces no Rust or TypeScript compile-time behaviour. The changed runner expression is stru… Unit Architecture Treat the Unit Architecture check as passed. The pull request changes runner-selection data in .github/workflows/ci.yml:76-81, documentation, and pure workflow-contract helpers in `tests/workflow_co…Domain Architecture PASS. The pull request changes only GitHub Actions runner selection, developer documentation, and workflow contract tests. It does not change domain models, commands, repositories, adapters, persisten… Full details: Docstring Coverage
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Explanation
Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 2 files. (1 skipped: 1 unsupported.)
Full details: Testing (Overall)
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Explanation
Pass this check. The contract reads the actual
ci.ymlmatrix label and parses its guard and both result labels.runner_label_shape_test.py:62-88requires the combined fork-or-pull_request.user.login == 'dependabot[bot]'guard,ubuntu-latesthosted arm, andubicloud-standard-2fallback. It therefore fails for the likely incorrect fork-only,github.actor, wrong-field, inverted-operator, missing-arm, or constant-label implementations. The supporting constants define the expected expression atrunner_label_support.py:34-43; the workflow uses that behaviour at.github/workflows/ci.yml:78-81. The test is non-vacuous because it reads and validates the changed workflow declaration.
Full details: User-Facing Documentation
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Explanation
Pass. The change affects internal GitHub Actions runner placement for repository CI, not
rstest-bddfunctionality used by library consumers. The pull request documents the runner behaviour indocs/developers-guide.md, which targets engineers and contributors. No user-facing change requires an update todocs/users-guide.md.
Full details: Module-Level Documentation
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Explanation
The pull request changes two Python modules, and both retain clear module-level docstrings.
runner_label_shape_test.pystates its purpose, failure cases, and usage.runner_label_support.pystates its purpose, utility, and relationships toworkflow_support,workflow_queries, andrunner_label_shape_test. The other changed files are YAML and Markdown, not modules.
Full details: Testing (Property / Proof)
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Explanation
PASS — The change adds a small boolean routing contract: fork status and Dependabot-author status produce four meaningful cases, including non-pull-request events. The complete table is easy to audit, so property-based testing is not required. The contract test asserts the exact combined guard and both runner labels at
tests/workflow_contracts/runner_label_shape_test.py:70-88; no lemma or proof assumption was introduced.
Full details: Testing (Compile-Time / Ui)
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Explanation
PASS. The pull request changes GitHub Actions YAML, documentation, and Python workflow-contract tests. It introduces no Rust or TypeScript compile-time behaviour. The changed runner expression is structured configuration, not generated or UI output that needs snapshot coverage. The focused contract assertions check the guard and both runner-label arms directly, which avoids brittle snapshots. The diff confirms the tests require
(github.event.pull_request.head.repo.fork || github.event.pull_request.user.login == 'dependabot[bot]'),ubuntu-latest, andubicloud-standard-2.
Full details: Unit Architecture
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Explanation
Treat the Unit Architecture check as passed. The pull request changes runner-selection data in
.github/workflows/ci.yml:76-81, documentation, and pure workflow-contract helpers intests/workflow_contracts/runner_label_support.py:39-42; it adds no query, command, fallible operation, injected dependency, stateful service, or side-effecting unit. The test change only asserts the expanded guard intests/workflow_contracts/runner_label_shape_test.py:77-84. The change therefore does not reduce architectural separation or make fallibility, mutation, dependencies, or responsibilities less visible.
Full details: Domain Architecture
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Explanation
PASS. The pull request changes only GitHub Actions runner selection, developer documentation, and workflow contract tests. It does not change domain models, commands, repositories, adapters, persistence, transport, or business invariants. The Dependabot condition remains in workflow infrastructure and does not introduce domain-to-infrastructure coupling.
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Full details: Testing (Unit And Behavioural)
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Explanation
The new tests verify only the textual shape of the YAML expression.
test_linux_lane_falls_back_to_github_hosted_for_forkscompares the parsed guard and its two labels, while the helper only parses strings. No test evaluates the selector for Dependabot pull requests, internal pull requests, fork pull requests, or push/dispatch events with nopull_requestpayload. The change affects the externally observable GitHub Actions runner selection, but the pull request adds no workflow-level or end-to-end test for that behaviour.Resolution
Add behavioural tests that evaluate the declared selector against representative event contexts: Dependabot pull request, human internal pull request, fork pull request, push, and workflow dispatch. Add a workflow-level smoke test or equivalent end-to-end verification that observes the selected runner label for the Dependabot and main-push paths. Keep the existing YAML shape tests for syntax and invariant checks.
Full details: Developer Documentation
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Explanation
The developer guide documents the Dependabot runner rule, but the relevant accepted ADR remains stale. The pull request changes
.github/workflows/ci.ymlto testgithub.event.pull_request.user.login == 'dependabot[bot]'together with the fork field.docs/adr-013-adopt-whitaker-no-unwrap-or-else-panic.md:316-329still records the fork-only expression and says every other event reaches Ubicloud. The ADR is not in the pull-request file diff, so the decision is not recorded consistently.Resolution
Add a dated addendum to ADR 013. Record the combined fork-or-Dependabot expression, the author-based
pull_request.user.logincheck, the unchanged Ubicloud path for pushes tomain, and the cold-cache consequence. Keep the 2026-09-16 fork addendum historical.
Full details: Observability
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Explanation
The pull request changes runner placement and cache behaviour. The Linux lane now sends Dependabot pull requests to
ubuntu-latest, while the guide states that these runs build from a cold cache. The diff adds no metrics and no decision-point diagnostic. Existing output reports onlyRUNNER_OS, not the selected runner environment, route reason, or cache outcome. This leaves hosted-runner usage, cache degradation, and related failures difficult to detect and diagnose.Resolution
Add bounded workflow observability at the runner-selection point. Report the selected runner environment, a non-sensitive route reason (
fork,dependabot,internal-pr, ornon-pr), cache hit or miss outcomes, and job duration in the log and job summary, including on failure. Add bounded counters and timing for hosted versus Ubicloud runs and cache outcomes if the repository has a metrics sink. Do not emit the pull-request login, tokens, payloads, or other high-cardinality values.
- Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts
Warning
Some tools did not complete. Review the errors below.
🔧 Vale (3.24.0)
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"Line": 3,
"Path": ".vale.ini",
"Text": "The StylesPath '/.vale/styles' doesn't exist.",
"Code": "E201",
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Forks and bots take the hosted lane
Other runs keep their Ubicloud name
The guard checks who opened the change
Tests track the rule across its range
The guide records the runner’s frame
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Inline comments:
Review comments at @docs/developers-guide.md:
- Around line 47-48: Update the pull-request event explanation in the
documentation to distinguish non-pull-request events from internal pull
requests: internal pull requests set the fork property to false but still
populate the user login. Clarify that the Dependabot condition selects
ubuntu-latest, while other internal pull requests reach Ubicloud.
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GitHub-hosted minutes cost nothing on a public repository, so a pull request authored by dependabot[bot] now falls back to ubuntu-latest like a fork's. The expression tests pull_request.user.login rather than github.actor, which changes when someone re-runs or pushes. A push to main has no pull_request payload and stays on Ubicloud, so main still writes the cache. The Linux matrix leg's `os:` expression (the lane that had the fork fallback) takes the combined condition; `runner_label_support.py` defines `HOSTED_GUARD` and `runner_label_shape_test.py` requires it. Bespoke contract, so this PR takes the full review gate.
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✅ Action performed
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Part of DF12-89
Rollout of the pattern in leynos/typos-config-builder#152 (reviewed and merged): Dependabot pull requests on a public repository run on GitHub-hosted runners, not Ubicloud. User decision of 19 October 2026.
Change
Every Ubicloud
runs-onthat has the fork fallback gains the Dependabot arm, in the pilot's shape:pull_request.user.login(the author), notgithub.actor, which changes on a re-run.mainhave nopull_requestpayload and stay on Ubicloud, so main's caches stay warm.os:expression (the lane that had the fork fallback) takes the combined condition;runner_label_support.pydefinesHOSTED_GUARDandrunner_label_shape_test.pyrequires it. Bespoke contract, so this PR takes the full review gate.docs/developers-guide.mdrecords the reason and the cold-cache consequence.Check script row (before)
["rstest-bdd", "pending", "2 ubicloud jobs, 1 lacking the arm; 1 without fork fallback"]from~/docs/jm5-dependabot-runners/bin/check.pyonorigin/HEADbefore this change.Gates
pytest tests/workflow_contracts(354 passed),mdtablefix --checkclean. The historical ADR addendum (2026-09-16) is left as written; the developers' guide carries the current expression.Mutation proof
ci.yml:user.loginreplaced byactor(all jobs)ci.yml: Dependabot arm removed (first job)tests/workflow_contracts/runner_label_support.py: `HOSTED_GUARD = f"({FORK_FIELD}Merge class
Mechanical rollout of the pilot's shape (same expression, same form of contract change, docs paragraph, mutation proof), per the lead's ruling of 19 October.
Overlapping open PRs
These open PRs touch the same kind of files; per the standing rulings they do not hold this PR and are left untouched:
Summary by Sourcery
Route Dependabot pull requests to GitHub-hosted runners while preserving Ubicloud execution for pushes and other eligible jobs.
New Features:
Enhancements:
Tests:
Selector proof
Selector proof: natural Dependabot runs on ubuntu-latest, all green: https://github.com/leynos/actix-v2a/actions/runs/39958329992, https://github.com/leynos/typos-config-builder/actions/runs/39990740324, https://github.com/leynos/agentland/actions/runs/39965006591; and a main push staying on ubicloud-standard-2: https://github.com/leynos/typos-config-builder/actions/runs/39181228629.