GitHub Actions Workflows Expert guidance for designing reliable, secure, and performant GitHub Actions CI/CD pipelines with patterns for matrix builds, reusable workflows, caching, and deployment automation. When to Use This Skill - Setting up CI/CD pipelines with GitHub Actions from scratch - Optimizing slow or expensive GitHub Actions workflows - Implementing matrix builds for multi-environment testing - Creating reusable workflows and composite actions for DRY pipelines - Managing secrets securely across environments - Configuring caching for dependency and build artifact reuse - Setting u…