Publish GitHub Action to Marketplace

[stephenway]

Description

Publish the Commit Coach GitHub Action to the GitHub Marketplace for easy installation and discovery.

Type of Change

• 🚀 Release/Deployment

Problem Statement

Currently, users need to reference the action by repository path (rasterandstate/commit-coach@v1), which is less discoverable and doesn't provide the benefits of marketplace listing.

Proposed Solution

Publish the action to GitHub Marketplace with:

1. Marketplace listing: Professional listing with description, screenshots, and usage examples
2. Version management: Proper semantic versioning for action releases
3. Documentation: Clear installation and usage instructions
4. Categories: Tag with appropriate categories (Code Quality, CI/CD, etc.)
5. Badges: Add marketplace badges to README

Benefits

• Discoverability: Users can find the action through marketplace search
• Trust: Marketplace listing adds credibility
• Ease of use: One-click installation from marketplace
• Versioning: Clear version management and release notes
• Analytics: Access to download and usage statistics

Implementation Steps

1. Prepare action metadata (description, icon, screenshots)
2. Create release workflow for marketplace publishing
3. Set up semantic versioning for action releases
4. Submit action for marketplace review
5. Update documentation with marketplace links
6. Add marketplace badges to README

Acceptance Criteria

• Action is published on GitHub Marketplace
• Users can install via marketplace interface
• Version releases are automated
• Documentation includes marketplace installation instructions
• README has marketplace badges

Additional Context

This is crucial for adoption as most users discover GitHub Actions through the marketplace. The action is already functional and ready for publication.