Modern CI/CD Pipelines: Automation That Delivers

name: CI/CD Pipeline

on:
  push:
    branches: [main, develop]
  pull_request:
    branches: [main]

env:
  NODE_VERSION: '20'
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  test:
    name: Test & Lint
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      
      - name: Setup Node.js
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: 'npm'
      
      - name: Install dependencies
        run: npm ci
      
      - name: Run linting
        run: npm run lint
      
      - name: Run tests
        run: npm test -- --coverage
      
      - name: Upload coverage
        uses: codecov/codecov-action@v3
        with:
          files: ./coverage/lcov.info

  build:
    name: Build & Push
    needs: test
    runs-on: ubuntu-latest
    if: github.event_name == 'push'
    permissions:
      contents: read
      packages: write
    
    steps:
      - uses: actions/checkout@v4
      
      - name: Login to Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      
      - name: Build and push
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: |
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}

  deploy-staging:
    name: Deploy to Staging
    needs: build
    runs-on: ubuntu-latest
    environment: staging
    if: github.ref == 'refs/heads/develop'
    
    steps:
      - name: Deploy to Kubernetes
        uses: azure/k8s-deploy@v4
        with:
          namespace: staging
          manifests: k8s/staging/
          images: |
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}

  deploy-production:
    name: Deploy to Production
    needs: build
    runs-on: ubuntu-latest
    environment: production
    if: github.ref == 'refs/heads/main'
    
    steps:
      - name: Deploy to Kubernetes
        uses: azure/k8s-deploy@v4
        with:
          namespace: production
          manifests: k8s/production/
          images: |
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}

// Jest unit test example
describe('UserService', () => {
  it('should create user with valid data', async () => {
    const userData = { email: 'test@example.com', name: 'Test User' };
    const user = await userService.create(userData);
    
    expect(user.id).toBeDefined();
    expect(user.email).toBe(userData.email);
  });
  
  it('should throw on duplicate email', async () => {
    const userData = { email: 'existing@example.com' };
    
    await expect(userService.create(userData))
      .rejects.toThrow('Email already exists');
  });
});