ci: check only changed markdown links on PRs - #405
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Limit Link Check runs to Markdown files modified relative to main on pull requests, while keeping full repository scans on pushes to main. This reduces PR link-check runtime without losing periodic full coverage. Co-authored-by: OpenCode <bret.mogilefsky@gsa.gov>
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Context
The Link Check job in `.github/workflows/markdown-quality.yml` scanned the entire repository on every pull request, even when a PR only touched a handful of files. This made PR runs slower than necessary.
Change
Mirror the optimization from GSA-TTS/agentic-coding-patterns#391:
This reduces PR link-check runtime while preserving periodic full coverage on merges to main.
Verification
Rollback
Revert this commit / remove the two added keys from the `tcort/github-action-markdown-link-check` step.
Security Impact
None. CI-only change; does not affect authentication, authorization, data handling, or attack surface.
AI-assisted (OpenCode).