CI CD

Set up a CI/CD pipeline for my Node.js Express app hosted on GitHub.
- Run ESLint and Prettier checks, then Jest unit tests
- Build a Docker image and push to GitHub Container Registry
- Deploy to AWS ECS staging on push to develop, production on push to main
- Send Slack notifications on failure

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:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          cache: 'npm'
      - run: npm ci
      - run: npm run lint
      - run: npm run format:check

  test:
    runs-on: ubuntu-latest
    needs: lint
    strategy:
      matrix:
        node-version: [18, 20, 22]
    services:
      postgres:
        image: postgres:16
        env:
          POSTGRES_PASSWORD: testpass
          POSTGRES_DB: testdb
        ports:
          - 5432:5432
        options: >-
          --health-cmd pg_isready
          --health-interval 10s
          --health-timeout 5s
          --health-retries 5
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-node@v4
        with:
          node-version: ${{ matrix.node-version }}
          cache: 'npm'
      - run: npm ci
      - run: npm test -- --coverage
        env:
          DATABASE_URL: postgres://postgres:testpass@localhost:5432/testdb
      - uses: actions/upload-artifact@v4
        with:
          name: coverage-${{ matrix.node-version }}
          path: coverage/

  build-and-push:
    runs-on: ubuntu-latest
    needs: test
    if: github.event_name == 'push'
    permissions:
      contents: read
      packages: write
    steps:
      - uses: actions/checkout@v4
      - uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: |
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ github.sha }}
            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
          cache-from: type=gha
          cache-to: type=gha,mode=max

  deploy-staging:
    runs-on: ubuntu-latest
    needs: build-and-push
    if: github.ref == 'refs/heads/develop'
    environment: staging
    steps:
      - uses: aws-actions/configure-aws-credentials@v4
        with:
          aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
          aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
          aws-region: us-east-1
      - run: |
          aws ecs update-service --cluster staging-cluster \
            --service my-app --force-new-deployment

  deploy-production:
    runs-on: ubuntu-latest
    needs: build-and-push
    if: github.ref == 'refs/heads/main'
    environment: production
    steps:
      - uses: aws-actions/configure-aws-credentials@v4
        with:
          aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
          aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
          aws-region: us-east-1
      - run: |
          aws ecs update-service --cluster production-cluster \
            --service my-app --force-new-deployment

  notify:
    runs-on: ubuntu-latest
    needs: [deploy-staging, deploy-production]
    if: always() && contains(needs.*.result, 'failure')
    steps:
      - uses: slackapi/slack-github-action@v1.25.0
        with:
          payload: |
            {"text": "Pipeline failed for ${{ github.repository }} on ${{ github.ref_name }}"}
        env:
          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}