fix: let the CLI's failure report win over the action's generic one

[kristof-siket]

Problem

When a deploy fails, the Prisma CLI reports the failure to the Builds API with the exact step and cause — for example DEPLOY.PREFLIGHT_FAILED with the missing env var named. The action then overwrites that report: its fail() patches failingStep and errorMessage unconditionally after the child exits, and the API is last-write-wins. The build ends up saying only ... exited with status 2.

Launch data (setup-PR onboarding review, Aug 10–31): 12 of 16 external deploy failures carried only the generic message. We could not tell why any of them failed.

Change

• main.mjs fail(): on the deploy/destroy phase (the phases where the CLI runs and can have reported), read the build first. If failingStep or errorMessage is already recorded, patch only state: failed. All other phases (install, build, config) keep the unconditional report — no CLI existed there, the action is the only witness.
• main.mjs: export PRISMA_BUILD_ID to the commands the action runs. The CLI reads this variable and reports into the action's build, instead of re-deriving the run identity from GITHUB_* variables and risking a mismatched duplicate build.
• post.mjs: same rule for the interruption report — never change a build that already reached a final state, and never replace a recorded error message.
• report.mjs: adds get(buildId) (GET /v1/builds/{id}) used by both.

Every read is wrapped like the other reports: if the lookup fails, the action falls back to today's behavior (full generic report). Nothing gets worse when the API is unreachable.

Tests

node --test tests/*.test.mjs — 53 pass (11 new: get, the deploy-failure deferral in both directions, and the lookup-failure fallback).

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• README.md
• main.mjs
• post.mjs
• report.mjs
• tests/report.test.mjs

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Summary by CodeRabbit

• Bug Fixes

  • Improved failure reporting so existing Prisma CLI error details are preserved instead of being overwritten.
  • Prevented completed or failed builds from being incorrectly marked as cancelled during cleanup.
  • Ensured generic error messages are added only when no specific failure details are available.
  • Linked CLI-reported failures to the correct build for more accurate deployment status and diagnostics.

• Documentation

  • Documented build failure-reporting and cancellation behavior.

Walkthrough

The reporter retrieves builds with GET /v1/builds/{id} and provides failurePatch for bounded failure updates. After build creation, the action exports PRISMA_BUILD_ID for Prisma CLI reporting. Deploy and destroy failures preserve existing CLI details. The post step reads the build before cancellation and leaves terminal builds unchanged. Tests cover lookup responses, lookup errors, and failure patches. The README documents the reporting behavior.

Merge Risk: ⚪ Minimal · up to d27a1

This change preserves detailed CLI failure reports while retaining the existing fallback behavior when build lookups fail. No actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: preserving the CLI failure report over the action's generic failure report.
Description check	✅ Passed	The description directly explains the failure-reporting problem, the implementation changes, fallback behavior, and tests.
Docstring Coverage	✅ Passed	Docstring coverage is 80.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 4 files. (1 skipped: 1 u…
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.

Full details: Docstring Coverage

Explanation

Docstring coverage is 80.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 4 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/defer-failure-reports-to-cli

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch fix/defer-failure-reports-to-cli

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Actionable comments posted: 1

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Inline comments:
In `@tests/report.test.mjs`:
- Line 294: Update the test’s existing-report lookup around existingLookupFailed
so reporter.get(BUILD_ID) is still invoked and the fetchImpl 500 response
exercises the lookup-failure fallback. Match the guarded lookup behavior in
main.mjs, or reuse extracted production patch-selection logic with a genuinely
rejected reporter.get call; do not bypass the lookup based on the test flag.

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between fd4ae30 and 79b6484.

📒 Files selected for processing (5)

• README.md
• main.mjs
• post.mjs
• report.mjs
• tests/report.test.mjs

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