cd: implement blue/green deployment strategy

.github/workflows/cd.yml

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+name: Continuous Deployment
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: self-hosted
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v3
+
+    - name: Setup initial environment
+      run: |
+        # Préparation des fichiers de configuration s'ils n'existent pas
+        if [ ! -f "nginx.conf" ]; then
+          echo "Creating initial NGINX configuration..."
+          echo "upstream backend { server app-blue:80; # server app-green:80; }" > nginx.conf
+          echo "server { listen 80; location / { proxy_pass http://backend; proxy_set_header Host \$host; proxy_set_header X-Real-IP \$remote_addr; } }" >> nginx.conf
+        fi
+
+    - name: Build and tag images
+      run: |
+        echo "Building Docker image..."
+        docker build -t angular-app:staging .
+        docker tag angular-app:staging angular-app:blue
+        docker tag angular-app:staging angular-app:green
+
+  deploy-staging:
+    needs: build
+    runs-on: self-hosted
+    environment: staging
+
+    steps:
+    - name: Deploy to staging
+      run: |
+        echo "Deploying to staging environment..."
+        docker-compose up -d app-staging
+        echo "Deployment to staging completed."
+
+    - name: Verify staging deployment
+      run: |
+        echo "Verifying staging deployment..."
+        sleep 5
+        curl -s http://localhost:8080 | grep -q "conduit" && echo "✅ Staging verification successful" || (echo "❌ Staging verification failed" && exit 1)
+
+  deploy-production:
+    needs: deploy-staging
+    runs-on: self-hosted
+    environment: production
+
+    steps:
+    - name: Checkout for production deployment
+      uses: actions/checkout@v3
+
+    - name: Blue/Green Deployment
+      run: |
+        echo "Executing Blue/Green deployment..."
+        ./scripts/deploy-blue-green.sh

docker-compose.yml

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+version: '3.8'
+
+services:
+  # Environnement de staging
+  app-staging:
+    image: angular-app:staging
+    container_name: app-staging
+    ports:
+      - "8080:80"
+    restart: unless-stopped
+    networks:
+      - app-network
+
+  # Production Blue
+  app-blue:
+    image: angular-app:blue
+    container_name: app-blue
+    ports:
+      - "8081:80"
+    restart: unless-stopped
+    networks:
+      - app-network
+
+  # Production Green
+  app-green:
+    image: angular-app:green
+    container_name: app-green
+    ports:
+      - "8082:80"
+    restart: unless-stopped
+    networks:
+      - app-network
+
+  # Proxy NGINX pour Blue/Green
+  proxy:
+    image: nginx:alpine
+    container_name: proxy
+    ports:
+      - "80:80"
+    volumes:
+      - ./nginx.conf:/etc/nginx/conf.d/default.conf
+    depends_on:
+      - app-blue
+      - app-green
+    restart: unless-stopped
+    networks:
+      - app-network
+
+networks:
+  app-network:
+    driver: bridge

nginx.conf

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+upstream backend {
+    server app-blue:80;
+    # server app-green:80; # Commenté par défaut, sera activé lors du déploiement
+}
+
+server {
+    listen 80;
+
+    location / {
+        proxy_pass http://backend;
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+    }
+}

scripts/deploy-blue-green.sh

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+#!/bin/bash
+
+# Variables
+TIMESTAMP=$(date +%s)
+CURRENT_ENV="blue"
+TARGET_ENV="green"
+
+# Détection de l'environnement actif
+if grep -q "server app-green:80;" nginx.conf && ! grep -q "# server app-green:80;" nginx.conf; then
+    CURRENT_ENV="green"
+    TARGET_ENV="blue"
+fi
+
+echo "Current environment: $CURRENT_ENV"
+echo "Target environment: $TARGET_ENV"
+
+# 1. Construction de l'image pour le nouvel environnement
+echo "Building image for $TARGET_ENV environment..."
+docker build -t angular-app:$TARGET_ENV .
+
+# 2. Démarrage du conteneur cible (s'il n'est pas déjà actif)
+echo "Starting $TARGET_ENV environment..."
+docker-compose up -d app-$TARGET_ENV
+
+# 3. Vérification que le nouvel environnement fonctionne
+TARGET_PORT=8081
+if [ "$TARGET_ENV" = "green" ]; then
+    TARGET_PORT=8082
+fi
+
+echo "Verifying $TARGET_ENV environment on port $TARGET_PORT..."
+sleep 5
+if curl -s http://localhost:$TARGET_PORT | grep -q "conduit"; then
+    echo "✅ $TARGET_ENV environment is working correctly"
+else
+    echo "❌ $TARGET_ENV environment verification failed"
+    exit 1
+fi
+
+# 4. Modification de la configuration NGINX
+echo "Updating NGINX configuration..."
+if [ "$CURRENT_ENV" = "blue" ]; then
+    # Activer Green, désactiver Blue
+    sed -i 's/server app-blue:80;/# server app-blue:80;/' nginx.conf
+    sed -i 's/# server app-green:80;/server app-green:80;/' nginx.conf
+else
+    # Activer Blue, désactiver Green
+    sed -i 's/server app-green:80;/# server app-green:80;/' nginx.conf
+    sed -i 's/# server app-blue:80;/server app-blue:80;/' nginx.conf
+fi
+
+# 5. Rechargement de NGINX
+echo "Reloading NGINX configuration..."
+docker-compose exec -T proxy nginx -s reload
+
+# 6. Vérification finale
+echo "Verifying final deployment..."
+sleep 2
+if curl -s http://localhost:80 | grep -q "conduit"; then
+    echo "✅ Production deployment successful!"
+else
+    echo "❌ Production verification failed"
+    exit 1
+fi
+
+echo "Deployment completed successfully!"