docs: document context repositories for workflows

workflows/enable.mdx

@@ -38,6 +38,22 @@
 
 For GitHub repositories, you must install the Mintlify GitHub App on each repository. Add repositories on the [GitHub app](https://dashboard.mintlify.com/settings/organization/github-app) settings page.
 
+### Context repositories
+
+Context repositories are cloned into the workflow's run environment as read-only references so the agent can read their code while it runs. They do not trigger the workflow.
+
+Use context repositories when the agent needs to read source code, configuration, or other files that live outside your docs repository. For example, point a changelog workflow at your product's backend repository so the agent can summarize recent changes. Or give a custom workflow access to an SDK repository so it can keep code examples accurate.
+
+Context repositories are available on:
+
+- Custom workflows
+- Changelog workflows (content update, code change, and scheduled variants)
+- Other non-maintenance workflows that run on a schedule
+
+Maintenance workflows (translations, link checks, typo checks, and style checks) operate only on your docs and do not support context repositories.
+
+To configure them, open the workflow's settings and select repositories from the **Context repositories** picker. The same GitHub App installation or GitLab connection requirements apply as for trigger repositories.
+
 ### Update mode
 
 Each workflow has a default mode for how it makes updates, either by directly updating your content repository or by opening a pull request.
@@ -72,6 +88,6 @@
 
 #### Run a translation immediately
 
 After saving the workflow, click **Translate now** to run it on demand using the currently saved target languages. The workflow must be enabled to trigger a manual run. Manual runs do not affect the workflow's regular trigger.
 
 <GitlabWorkflowSetup />