Add workflow to auto-sync updates.json.commit on main pushes

[Copilot]

This PR adds automation to keep updates.json’s commit field aligned with the latest commit on main. On every push to main, the workflow updates the field and writes back only when a change is required.

• Workflow trigger + permissions

  • Added .github/workflows/update-updates-json.yml
  • Runs on push to main
  • Uses contents: write to commit back repository changes

• updates.json commit sync

  • Reads updates.json, sets commit to the triggering SHA, and rewrites JSON with stable formatting
  • Avoids unnecessary commits by exiting when updates.json is unchanged

• Loop prevention + commit behavior

  • Skips the job when actor is github-actions[bot] to prevent recursive workflow-triggered commits
  • Commits with bot identity and pushes the single-file update

jobs:
  update-commit:
    if: github.actor != 'github-actions[bot]'
    steps:
      - uses: actions/checkout@v4
      - run: |
          python3 - <<'PY'
          import json, os
          with open("updates.json", "r", encoding="utf-8") as f:
              data = json.load(f)
          data["commit"] = os.environ["LATEST_COMMIT"]
          with open("updates.json", "w", encoding="utf-8") as f:
              json.dump(data, f, indent=2); f.write("\n")
          PY

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