ci-cd-pipeline

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• SKILL.md

SKILL.md (first lines)

# CI/CD Pipeline Patterns

GitHub Actions workflows for consistent, fast, and reliable delivery pipelines.

## Workflow Structure

```yaml
# .github/workflows/ci.yml
name: CI

on:
  push:
    branches: [main, develop]
  pull_request:
    branches: [main]
  workflow_dispatch:        # manual trigger

concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true  # cancel outdated runs on same branch

jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'
      - run: npm ci
      - run: npm run lint

  test:
    runs-on: ubuntu-latest
    needs: lint              # runs after lint passes
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'
      - run: npm ci
      - run: npm test -- --coverage

  build:
    runs-on: ubuntu-latest
    needs: test
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: '20'
          cache: 'npm'
      - run: npm ci
      - run: npm run build
```

## Matrix Builds

Test across multiple versions and operating systems in parallel.

```yaml
jobs:
  test:
    strategy:
      fail-fast: false       # don't cancel others if one fails
      matrix:
        node: ['18', '20', '22']
        os: [ubuntu-latest, macos-latest, windows-latest]
        exclude:
          - os: windows-latest
            node: '18'       # skip this combination

    runs-on: ${{ matrix.os }}
    name: Test Node ${{ matrix.node }} on ${{ matrix.os }}

    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: ${{ matrix.node }}
          cache: 'npm'
      - run: npm ci
      - run: npm test
```

```yaml
# Python matrix example
jobs:
  test:
    strategy:
      matrix:
        python: ['3.10', '3.11', '3.12']
        django: ['4.2', '5.0']
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-python@v5
        with:
          python-version: ${{ matrix.python }}
      - run: pip install django==${{ matrix.django }} -r requirements-test.txt
      - run: pytest
```

## Dependency Caching

```yaml
# Node.js: cache npm or yarn
- uses: actions/setup-node@v4
  with:
    node-version: '20'
    cache: 'npm'             # auto-caches ~/.npm

# Manual cache (more control)
- uses: actions/cache@v4
  id: npm-cache
  with:

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