ci: add workflow to check lib-sync

[klaskosk]

It is possible for the sync-libs automation to break if changes are made to sync configs or schemes that have not been verified to work with automation. This commit introduces a new workflow that runs specifically on PRs updating these paths and ensures that running make lib-sync against the PR does not introduce any errors.

Assisted-by: Cursor

Summary by CodeRabbit

• Chores
  • Added an automated CI check that verifies dependency sync and code vetting on pull requests to main and release branches; also supports manual runs.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a GitHub Actions workflow that verifies lib-sync is up to date on pull requests to main and release-* branches and supports manual dispatch; it checks out the repo, sets Go from go.mod, runs the lib-sync target, and validates the vet step.

Changes

Cohort / File(s)	Summary
CI/CD Workflow Configuration /.github/workflows/sync-checker.yml	New workflow (34 lines added) that triggers on pull requests to main and release-* and manual dispatch. Job checks out code, sets up Go using go.mod, runs the lib-sync target, and runs vet validation.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'ci: add workflow to check lib-sync' directly and clearly describes the main change: adding a CI workflow for checking lib-sync, which matches the changeset that adds a GitHub Actions workflow.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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[klaskosk]

Example failure case triggered

[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In @.github/workflows/sync-checker.yml:
- Around line 5-7: The branches filter is using a regex-like string
'release-\d.\d\d' which GitHub Actions does not support; update the branches
array entry to a glob pattern such as 'release-[0-9].[0-9][0-9]' (or another
appropriate glob like 'release-*' if broader matching is acceptable) so the
workflow will trigger for release branches; modify the branches list entry that
currently contains 'release-\d.\d\d' to the chosen glob pattern.