Writing GitHub Actions Workflows

name: CI
 
on:
  push:
    branches: [main]
  pull_request:
    branches: [main]
 
jobs:
  test:
    runs-on: ubuntu-latest
 
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
 
      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
          node-version: 20
          cache: npm
 
      - name: Install dependencies
        run: npm ci
 
      - name: Lint
        run: npm run lint
 
      - name: Test
        run: npm test

on:
  push:
    branches: [main, develop]
    paths:
      - "src/**"           # only trigger on source changes
  pull_request:
  schedule:
    - cron: "0 6 * * 1"   # every Monday at 6am UTC
  workflow_dispatch:        # manual trigger from GitHub UI

env:
  NODE_ENV: test            # workflow-level
 
jobs:
  deploy:
    runs-on: ubuntu-latest
    env:
      APP_URL: https://staging.example.com   # job-level
    steps:
      - name: Deploy
        env:
          API_KEY: ${{ secrets.DEPLOY_API_KEY }}  # from GitHub Secrets
        run: ./scripts/deploy.sh

jobs:
  test:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        node: [18, 20, 22]
    steps:
      - uses: actions/setup-node@v4
        with:
          node-version: ${{ matrix.node }}
      - run: npm test

- uses: actions/cache@v4
  with:
    path: ~/.npm
    key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
    restore-keys: |
      ${{ runner.os }}-node-

jobs:
  test:
    runs-on: ubuntu-latest
    steps:
      - run: npm test
 
  deploy:
    needs: test          # only runs if test passes
    runs-on: ubuntu-latest
    steps:
      - run: ./deploy.sh