github-actions

name	github-actions
description	Workflow YAML, jobs/steps, matrix builds, actions marketplace, caching, environments, secrets, service containers, artifacts, self-hosted runners.

github-actions

Automate CI/CD with GitHub Actions.

Workflow structure

• on: push, pull_request, schedule, workflow_dispatch
• jobs: runs-on, strategy.matrix, needs
• steps: uses, run, env, with
• Conditional execution with if expressions

Marketplace and actions

• Official actions: actions/checkout, actions/setup-node
• Community actions from GitHub Marketplace
• Docker container actions
• JavaScript and composite actions

Optimization

• Dependency caching with actions/cache
• Matrix builds for cross-version testing
• Parallel job execution
• Artifact upload and download

Security

• Environments with protection rules
• Encrypted secrets per environment
• OIDC for cloud provider auth
• Self-hosted runners for private infra