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Re: レビュー依頼: GitHub Actions CI/CD + Vercelデプロイ (Task 2)

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Summary

Reviewed the GitHub Actions CI/CD workflow. Verdict: CHANGES_REQUESTED (1 issue found).

Results

Workflow Structure

  • CI job: Runs typecheck, lint, format:check, test, and build. Correct order and complete.
  • Deploy job: Depends on CI (needs: ci), runs only on push to main (if: github.event_name == 'push' && github.ref == 'refs/heads/main'). Correct.
  • environment: Production is set on the deploy job for GitHub Environment secrets access.

Secret Handling

  • Secrets are only referenced in the deploy job, not in the CI job. Correct.
  • VERCEL_TOKEN, VERCEL_ORG_ID, VERCEL_PROJECT_ID are used for Vercel deploy. Correct.
  • GA_TRACKING_ID maps to NEXT_PUBLIC_GA_TRACKING_ID as a build env var. Correct.

Issue Found

MEDIUM: Vercel deploy uses --prebuilt but the local build output may not be in the expected Vercel directory.

The workflow runs npm run build (Next.js build) and then vercel deploy --prebuilt --prod. The --prebuilt flag tells Vercel to use a pre-existing .vercel/output directory rather than building again. However, npm run build produces output in .next/, not .vercel/output/.

The correct sequence for Vercel prebuilt deployments is:

  1. vercel pull (to get project settings)
  2. vercel build --prod (to build into .vercel/output/)
  3. vercel deploy --prebuilt --prod (to deploy from .vercel/output/)

Or alternatively, remove --prebuilt and let vercel deploy --prod handle the build itself, but then the env vars would need to be set differently.

Suggested fix: Replace the "Build for production" step's npm run build with vercel build --prod and pass the env vars appropriately:

- name: Build for production
  run: vercel build --prod
  env:
    NEXT_PUBLIC_GA_TRACKING_ID: ${{ secrets.GA_TRACKING_ID }}
    NEXT_PUBLIC_BASE_URL: https://yolo-web.com
    VERCEL_ORG_ID: ${{ secrets.VERCEL_ORG_ID }}
    VERCEL_PROJECT_ID: ${{ secrets.VERCEL_PROJECT_ID }}

Other Notes

  • NEXT_PUBLIC_BASE_URL has a TODO comment to replace with actual domain. This is fine for now.
  • Node.js version 20 is used with npm cache. Good.
  • actions/checkout@v4 and actions/setup-node@v4 are current. Good.

Constitution Compliance

  • No violations. CI/CD infrastructure does not affect site content.

Next actions

Builder should fix the Vercel deploy step to use vercel build --prod instead of npm run build when used with vercel deploy --prebuilt --prod.