Tutoriel : Mettre en place CI/CD avec GitHub Actions et Docker pour PME

# Stage 1: Build
FROM node:20-alpine AS builder

WORKDIR /app

COPY package*.json ./
RUN npm ci --only=production

COPY . .
RUN npm run build

# Stage 2: Production
FROM node:20-alpine

WORKDIR /app

COPY --from=builder /app/node_modules ./node_modules
COPY --from=builder /app/dist ./dist
COPY --from=builder /app/package.json ./

ENV NODE_ENV=production
EXPOSE 3000

CMD ["node", "dist/index.js"]

version: '3.8'

services:
  app:
    build: .
    ports:
      - "3000:3000"
    environment:
      - DATABASE_URL=${DATABASE_URL}
      - API_KEY=${API_KEY}
    volumes:
      - ./logs:/app/logs
    restart: unless-stopped

  postgres:
    image: postgres:16-alpine
    environment:
      - POSTGRES_PASSWORD=${DB_PASSWORD}
    volumes:
      - postgres_data:/var/lib/postgresql/data

volumes:
  postgres_data:

name: CI/CD Pipeline

on:
  push:
    branches: [ main ]
  pull_request:
    branches: [ main ]
  workflow_dispatch:

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

jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=sha,prefix={{branch}}-

      - name: Build and push Docker image
        uses: docker/build-push-action@v5
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha
          cache-to: type=gha,mode=max

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: Run linter
        run: npm run lint

      - name: Run tests
        run: npm test

      - name: Check build
        run: npm run build

  build:
    needs: test
    runs-on: ubuntu-latest
    # ... reste du job build

- name: Build and push Docker image
  uses: docker/build-push-action@v5
  with:
    context: .
    push: ${{ github.event_name != 'pull_request' }}
    tags: ${{ steps.meta.outputs.tags }}
    cache-from: type=gha
    cache-to: type=gha,mode=max

- name: Notify on failure
  if: failure()
  uses: 8398a7/action-slack@v3
  with:
    status: ${{ job.status }}
    webhook_url: ${{ secrets.SLACK_WEBHOOK }}

  deploy:
    needs: build
    runs-on: ubuntu-latest
    if: github.ref == 'refs/heads/main' && github.event_name == 'push'

    steps:
      - name: Deploy to production
        uses: appleboy/ssh-action@v1.0.0
        with:
          host: ${{ secrets.SSH_HOST }}
          username: ${{ secrets.SSH_USER }}
          key: ${{ secrets.SSH_KEY }}
          script: |
            cd /opt/app

            # Login to GitHub Container Registry
            echo ${{ secrets.GITHUB_TOKEN }} | docker login ghcr.io -u ${{ github.actor }} --password-stdin

            # Pull latest image
            docker pull ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:main-${{ github.sha }}

            # Update docker-compose to use new image
            export IMAGE_TAG=main-${{ github.sha }}

            # Zero-downtime deployment
            docker-compose up -d --no-deps --build app

            # Cleanup old images
            docker image prune -af --filter "until=72h"

script: |
  cd /opt/app

  # Save current version
  CURRENT_VERSION=$(docker-compose images -q app)

  # Deploy new version
  docker pull ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:main-${{ github.sha }}
  export IMAGE_TAG=main-${{ github.sha }}
  docker-compose up -d --no-deps app

  # Wait and check health
  sleep 10
  if ! curl -f http://localhost:3000/health; then
    echo "Health check failed, rolling back..."
    docker tag $CURRENT_VERSION app:latest
    docker-compose up -d --no-deps app
    exit 1
  fi

  echo "Deployment successful"

version: '3.8'

services:
  app:
    image: ghcr.io/votre-org/votre-app:${IMAGE_TAG}
    ports:
      - "3000:3000"
    environment:
      - NODE_ENV=production
      - DATABASE_URL=${DATABASE_URL}
    restart: unless-stopped
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:3000/health"]
      interval: 30s
      timeout: 10s
      retries: 3