GitHub Actions workflow as alternative to GitHub App

[fusion94]

Summary

Provide a standalone GitHub Action that can check CLA status as an alternative to installing the CLAHub GitHub App.

Motivation

Some organizations prefer Actions over third-party App installations due to security policies. A GitHub Action lowers the barrier to adoption for teams that can't install Apps.

Implementation notes

• Action calls the CLAHub REST API to check PR authors
• Uses GITHUB_TOKEN for PR status updates and the CLAHub API key for signature lookups
• Publish to GitHub Marketplace
• Simpler setup: just add a workflow file, no App installation needed
• Trade-off: no webhook-driven re-checks (polling or workflow_run trigger instead)

Phase

Phase 6: Integrations (v3.0 roadmap)