@tank/github-actions-cheatsheet

To write a GitHub Actions workflow with matrix builds and reusable workflows, define matrix strategies under jobs and reference reusable workflows using the workflow_call trigger. This Skill provides concise YAML snippets and syntax references to reconstruct valid CI/CD automation patterns quickly.

GitHub Actions workflow syntax for triggers, expressions, and contexts uses specific YAML keys like 'on' for events and '${{ }}' for evaluating expressions. This Skill summarizes official syntax and practical snippets to help you apply contexts and environment variables correctly.

GitHub Actions YAML supports concurrency and permissions configuration in CI/CD pipelines through dedicated workflow and job-level keys. This Skill offers operational guidance and reference coverage for setting these constraints to manage concurrent runs and secure secrets.

To debug a broken GitHub Actions workflow under time pressure, compare your YAML against official syntax references for jobs, steps, and artifacts. This Skill translates documentation into compact working examples to help you identify and fix invalid workflow structures fast.

Reusable workflows in GitHub Actions can pass artifacts and outputs between jobs by defining outputs in the called workflow and mapping them in the caller. This Skill provides practical snippets for configuring artifacts, outputs, and common CI/CD patterns.

The best way to reference GitHub Actions environment variables and secrets across jobs is using the 'env' context and the 'secrets' context within your YAML steps. This Skill supplies a cheat sheet covering syntax for securely injecting environment variables and secrets.