Resync ci_dependabot_automerge.yml with the canonical template (guidance#15) - #4
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Copies the workflow verbatim from vln-devsecops/guidance, pulling in guidance#15 (head-SHA re-check before merge, GITHUB_TOKEN dropped to read-only) and guidance#16 (gate on the PR author instead of github.actor, refuse foreign commits, fail closed when no check ever appears). Verified with guidance's tests/automerge_gate_test.sh (11/11 passing) against this repo's copy.
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Pull request overview
This PR resyncs the repository’s Dependabot auto-merge workflow to match the canonical vln-devsecops/guidance@main template, incorporating the gating and safety fixes from guidance#15/#16 for pull_request_target-based auto-merge.
Changes:
- Reduces
GITHUB_TOKENpermissions to read-only while continuing to use the PAT (DEPENDABOT_AUTOMERGE_TOKEN) for all write operations. - Fixes Dependabot detection to use the PR author (
github.event.pull_request.user.login) and adds explicit protection against non-Dependabot commits. - Strengthens gating behavior: fails closed when no sibling checks appear, and re-validates the PR head SHA immediately before enabling auto-merge.
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Summary
.github/workflows/ci_dependabot_automerge.ymlverbatim fromvln-devsecops/guidance@main, byte-identical.GITHUB_TOKENto read-only since every write already uses the PAT) and guidance#16 (gates ongithub.event.pull_request.user.logininstead ofgithub.actorso the job doesn't silently no-op onreopened; refuses PRs carrying non-Dependabot commits; fails closed instead of merging unguarded when no check ever appears).runbooks/dependabot-automerge.mdin guidance.Verification
Ran guidance's
tests/automerge_gate_test.sh(unmodified) against this repo's copy of the workflow — 11/11 passing:GITHUB_TOKENwrite scopeDEPENDABOT_AUTOMERGE_TOKENis already provisioned on this repo, so these changes take effect on merge. This repo has one other PR-triggered workflow (ci_validate_cmake.yml) for the gate to wait on.Closes #3.
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