Fix automatic update workflow

[acburdine]

no ref

• use PAT for commit push as well as PR creation, since built-in permission tokens don't trigger downstream CI checks

[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

Run ID: 2b410277-5a5c-4e9a-8c02-0ef6de8e2ae3

📥 Commits

Reviewing files that changed from the base of the PR and between f2dcba0 and 72ceb3e.

📒 Files selected for processing (1)

• .github/workflows/update.yml

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Walkthrough

This change modifies the GitHub Actions workflow file .github/workflows/update.yml. The update job's contents permission is changed from write to read, with added comments clarifying that default-branch pushes rely on a custom PAT. The GH_TOKEN environment variable in the "Commit and push changes" step is switched from secrets.GITHUB_TOKEN to secrets.OFFICIAL_IMAGES_PR_TOKEN.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Possibly related PRs

• TryGhost/docker-library-ghost#473: Both PRs modify the same workflow's "Commit and push changes" authentication/push token setup via gh auth setup-git.

Suggested reviewers: 9larsons

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly reflects the main change: updating the automatic update workflow.
Description check	✅ Passed	The description is directly related to the workflow token and PAT change.
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/update-flow

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