[Copilot]

The release-sync job failed when release/13.6 advanced after checkout but before the automated merge push. The workflow now refreshes the release tip and retries the sync instead of failing on a transient non-fast-forward rejection.

• Release sync retry
  • Fetches main and the active release branch for each attempt.
  • Resets the local release branch to its current remote tip.
  • Retries rejected pushes up to three times.

for attempt in {1..3}; do
  git fetch origin main "$BRANCH"
  git checkout -B "$BRANCH" "origin/$BRANCH"
  # merge pinned main, then push
done

• Regression coverage
  • Adds assertions to the existing release-sync test script for the refresh-and-retry workflow contract.

[Copilot]

Copilot review overview

🟡 Changes recommended

The retry implementation can become non-deterministic (re-pinning main on each attempt) and currently retries on any push failure rather than confirming a push race, which can mask real failures.

Get a fresh assessment by requesting another Copilot review.

Review effort: Lite
Findings: 2

Open (2)

• Recompute of MAIN_SHA makes retries target different main commits · New
• Retry loop masks non-race git push failures · New

What changed in this PR

Improves the release-branch sync GitHub Actions workflow to better tolerate concurrent updates to the release branch by adding a refresh-and-retry loop around the merge/push, and adds lightweight regression assertions to ensure the workflow retains this behavior.

Changes:

• Add a 3-attempt loop that re-fetches and re-checks out the release branch before re-running the sync and pushing.
• Emit workflow warnings on transient push rejection and fail after exhausting retries.
• Add script assertions that the workflow includes retry/refresh/push-handling logic.

File	Description
.github/​workflows/​update-release-branch.yml	Adds refresh-and-retry behavior around the merge helper + push to handle non-fast-forward races.
.github/​scripts/​test-merge-main-into-release.sh	Adds grep-based assertions to enforce the workflow’s retry/refresh contract.

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