github-actions

# GitHub Actions Skill

Patterns for GitHub Actions workflows.

## Workflow Triggers

### Common Triggers

```yaml
on:
  # Push events
  push:
    branches: [main, develop]
    paths:
      - 'src/**'
      - 'package.json'
    paths-ignore:
      - '**.md'
      - 'docs/**'

  # Pull requests
  pull_request:
    branches: [main]
    types: [opened, synchronize, reopened]

  # Manual trigger
  workflow_dispatch:
    inputs:
      environment:
        description: 'Deploy environment'
        required: true
        default: 'staging'
        type: choice
        options:
          - staging
          - production

  # Scheduled
  schedule:
    - cron: '0 0 * * *'  # Daily at midnight

  # Release
  release:
    types: [published]
```

### Conditional Execution

```yaml
jobs:
  build:
    runs-on: ubuntu-latest
    if: github.event_name == 'push' || github.event.pull_request.draft == false

  deploy:
    if: github.ref == 'refs/heads/main' && github.event_name == 'push'
```

## Job Patterns

### Parallel Jobs

```yaml
jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - run: npm run lint

  test:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - run: npm test

  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - run: npm run build
```

### Sequential Jobs

```yaml
jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - run: npm test

  build:
    needs: test
    runs-on: ubuntu-latest
    steps:
      - run: npm run build

  deploy:
    needs: build
    runs-on: ubuntu-latest
    steps:
      - run: ./deploy.sh
```

### Matrix Builds

```yaml
jobs:
  test:
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [ubuntu-latest, macos-latest, windows-latest]
        node: [18, 20]
        exclude:
          - os: windows-latest
            node: 18
      fail-fast: false
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node