github-actions

Master GitHub Actions CI/CD workflows with production-grade security and performance patterns. Use ONLY when explicitly setting up CI/CD pipelines specifically via GitHub Actions, setting up matrix strategies, caching dependencies, managing artifacts, or implementing reusable workflows. For deployment requests, use ONLY when the deploy step is inside a .github/workflows file. NOT for GitLab or autonomous-dev. NOT for Render, AWS, Azure, or GCP deployments unless explicitly triggered from within a CI/CD workflow context. Do NOT trigger for generic "deploy my app" requests without clarifying the target platform.