ci: update CI workflow and docker-compose for microservices build targets

[rsun19]

Summary

Updates the CI pipeline and docker-compose.yml to align with the microservices split.

CI Changes (ci.yml)

• Replaced single backend and worker build steps with individual build-and-push steps for each microservice: agencies, routes, stops, alerts, vehicles, ingestion
• Each service gets its own GHA cache scope for faster incremental builds
• Fixed frontend build arg: BACKEND_URL now points to http://nginx:80 instead of the old monolith http://backend:3000

docker-compose Changes

• Added explicit target: production to all service build configs to ensure the correct Docker stage is used in production builds

Summary by CodeRabbit

• Chores
  • Optimized Docker build configuration for production deployment across services.
  • Updated CI/CD pipeline to build and cache service images separately for improved deployment efficiency.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 37ba317e-bf5b-460a-b959-b75350552da8

📥 Commits

Reviewing files that changed from the base of the PR and between a7b4ecd and a9be025.

📒 Files selected for processing (2)

• .github/workflows/ci.yml
• docker-compose.yml

---

📝 Walkthrough

Walkthrough

The PR refactors the Docker build strategy from monolithic backend/worker images to separate production images for each transit service. Docker Compose and the CI/CD pipeline are updated to build and deploy agencies, routes, stops, alerts, vehicles, and ingestion as independent containerized services, with the frontend reconfigured to communicate via nginx instead of a direct backend service connection.

Changes

Microservices Docker Build Refactor

Layer / File(s)	Summary
Docker Compose Build Targets docker-compose.yml	Each of the agencies, routes, stops, alerts, vehicles, ingestion, and frontend services adds build.target: production to specify which Dockerfile build stage to use.
CI Microservice Image Build & Push .github/workflows/ci.yml	The deploy job replaces the previous backend and worker image build steps with separate build-and-push steps for agencies, routes, stops, alerts, vehicles, and ingestion. Each uses a service-specific Dockerfile, targets production, pushes with commit SHA tags, and uses scoped GitHub Actions cache entries.
Frontend Backend URL Configuration .github/workflows/ci.yml	Frontend Docker build argument BACKEND_URL is changed from http://backend:3000 to http://nginx:80 to reflect the updated service architecture.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• rsun19/transit-tracker#15: Both PRs modify the CI Docker build pipeline to target production build stages and scope build caches for container images.
• rsun19/transit-tracker#14: Both PRs address building Docker production stages; the related PR adds target: production to CI build steps while this PR adds the same target to docker-compose service build configurations.
• rsun19/transit-tracker#9: Both PRs modify the deploy job in .github/workflows/ci.yml; the related PR initially introduced the deploy job while this PR refactors it to build separate service images.

Poem

🐇 Microservices Dance

The monolith splits into pieces so bright,
Each service builds its production height,
Agencies, routes, and stops align,
Through nginx they chat—the gateway divine! 🚌✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main change: updating CI workflow and docker-compose configuration to support microservices build targets, which aligns with the changeset modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix-ci-workflow

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}