[plan] Enhance actionlint integration based on Go Fan review

[github-actions]

Overview

This tracking issue covers enhancements to our actionlint integration identified in the Go Fan module review. While our current integration is excellent (5/5 rating), there are opportunities for performance improvements, better UX, and enhanced developer experience.

Source: Discussion #7472

Current State

✅ Excellent integration - Follows all best practices:

• Latest version (v1.7.9)
• Docker-based execution
• Comprehensive error handling
• Automatic configuration
• Strict/non-strict modes

Planned Improvements

This plan focuses on high-impact, quick-win improvements that enhance performance and developer experience:

Performance

1. Parallel multi-file execution - Process multiple workflow files in a single Docker run (2-3x faster)

Developer Experience

2. Log actionlint version - Improve debugging and reproducibility
3. Add Makefile target - Easy local testing for contributors
4. Aggregate statistics - Show validation summary across all workflows

Quality & Documentation

5. Enhanced user messaging - Clarify that actionlint includes shellcheck & pyflakes

Success Criteria

• Faster validation for multi-workflow projects
• Better debugging information
• Easier local development workflow
• Clear validation results summary

Out of Scope (Future Enhancements)

These are valuable but deferred to keep this work focused:

• Error severity classification
• Problem matcher support for PR annotations
• Auto-detect custom runner labels
• Pre-commit hook integration

---

Related: #7472

AI generated by Plan Command for discussion #7472