Use when user creates or debugs GitHub Actions workflows, asks about CI/CD pipelines in .github/workflows/, reusable workflows, composite actions, matrix builds, artifact caching, secrets management, or workflow_dispatch triggers. Do NOT use for GitLab CI, Jenkins, CircleCI, or other CI/CD platforms. Do NOT use for GitHub API or GitHub CLI questions unrelated to Actions.
Every workflow lives in .github/workflows/. Core structure: