Fixed update workflow to be re-runnable

[acburdine]

no ref

• if the official-images update fails, there's not a good way to re-run this workflow
• update the official-images push part of the script to be idempotent so it can be re-ran on failure

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: c94682db-b20c-47b3-ac87-b7ce6ad8adcd

📥 Commits

Reviewing files that changed from the base of the PR and between e0307e3 and 68bcf32.

📒 Files selected for processing (1)

• .github/workflows/update.yml

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Walkthrough

The workflow now serializes shared update runs and checks out the current default-branch tip. Commit metadata is always computed, either from new versions.json changes or the latest related commit. Image tooling and official-images PR creation can run during retries, with fallback commit SHA handling. The PR flow force-recreates its branch and detects existing pull requests by URL.

Estimated code review effort: 3 (Moderate) | ~20 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: making the update workflow rerunnable.
Description check	✅ Passed	The description matches the changeset by explaining the official-images update flow is being made rerunnable on failure.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/idempotent

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