ci: bind check-label composite inputs via env before shell

[SashaMIT]

Summary

• Bind inputs.skip-message and the computed label-contains result through env: before shell echo/notice steps in the check-label composite action.
• Same class as GitHub’s documented script-injection guidance for interpolating composite action inputs into run: scripts.

Test plan

• PRs with the configured label still set skip=true and print the skip message
• PRs without the label still set skip=false

Made with Cursor

[github-actions]

🟢 PR Severity: LOW

github-actions | 1 file | 15 lines changed

🟢 Low (1 file)

• .github/actions/check-label/action.yml - CI/CD configuration change under .github/*

Analysis

This PR only modifies a GitHub Actions composite action (.github/actions/check-label/action.yml), a small (9 additions / 6 deletions) CI/CD configuration change. It does not touch any Go source, wallet/channel/HTLC logic, or database migrations, so it falls under the LOW severity tier reserved for docs/scripts/CI configuration and warrants only a best-effort review.

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