Implement zero-downtime deployment strategy

- Add rolling update mechanism for seamless deployments
- Start new container on port 3001, health check, then switch
- Preserve database and redis connections during updates
- Automatic fallback to fresh deployment if no current container
- Add advanced nginx load balancer configuration for future use
- Eliminate container name conflicts with proper cleanup
- Website stays online during deployments

.gitea/workflows/ci-cd.yml

@@ -48,9 +48,25 @@ jobs:
           docker build -t ${{ env.DOCKER_IMAGE }}:latest .
           docker tag ${{ env.DOCKER_IMAGE }}:latest ${{ env.DOCKER_IMAGE }}:$(date +%Y%m%d-%H%M%S)
 
-      - name: Stop existing services
+      - name: Prepare for zero-downtime deployment
         run: |
-          docker compose down || true
+          echo "🚀 Preparing zero-downtime deployment..."
+          
+          # Check if current container is running
+          if docker ps -q -f name=portfolio-app | grep -q .; then
+            echo "📊 Current container is running, proceeding with zero-downtime update"
+            CURRENT_CONTAINER_RUNNING=true
+          else
+            echo "📊 No current container running, doing fresh deployment"
+            CURRENT_CONTAINER_RUNNING=false
+          fi
+          
+          # Ensure database and redis are running
+          echo "🔧 Ensuring database and redis are running..."
+          docker compose up -d postgres redis
+          
+          # Wait for services to be ready
+          sleep 10
 
       - name: Verify secrets and variables before deployment
         run: |
@@ -86,9 +102,86 @@ jobs:
           
           echo "✅ All required secrets and variables are present"
 
-      - name: Start services with Docker Compose
+      - name: Deploy with zero downtime
         run: |
-          docker compose up -d
+          echo "🚀 Deploying with zero downtime..."
+          
+          if [ "$CURRENT_CONTAINER_RUNNING" = "true" ]; then
+            echo "🔄 Performing rolling update..."
+            
+            # Start new container with temporary name
+            docker run -d \
+              --name portfolio-app-new \
+              --restart unless-stopped \
+              --network portfolio_net \
+              -p 3001:3000 \
+              -e NODE_ENV=${{ vars.NODE_ENV }} \
+              -e LOG_LEVEL=${{ vars.LOG_LEVEL }} \
+              -e DATABASE_URL=postgresql://portfolio_user:portfolio_pass@postgres:5432/portfolio_db?schema=public \
+              -e REDIS_URL=redis://redis:6379 \
+              -e NEXT_PUBLIC_BASE_URL="${{ vars.NEXT_PUBLIC_BASE_URL }}" \
+              -e NEXT_PUBLIC_UMAMI_URL="${{ vars.NEXT_PUBLIC_UMAMI_URL }}" \
+              -e NEXT_PUBLIC_UMAMI_WEBSITE_ID="${{ vars.NEXT_PUBLIC_UMAMI_WEBSITE_ID }}" \
+              -e MY_EMAIL="${{ vars.MY_EMAIL }}" \
+              -e MY_INFO_EMAIL="${{ vars.MY_INFO_EMAIL }}" \
+              -e MY_PASSWORD="${{ secrets.MY_PASSWORD }}" \
+              -e MY_INFO_PASSWORD="${{ secrets.MY_INFO_PASSWORD }}" \
+              -e ADMIN_BASIC_AUTH="${{ secrets.ADMIN_BASIC_AUTH }}" \
+              ${{ env.DOCKER_IMAGE }}:latest
+            
+            # Wait for new container to be ready
+            echo "⏳ Waiting for new container to be ready..."
+            sleep 15
+            
+            # Health check new container
+            for i in {1..20}; do
+              if curl -f http://localhost:3001/api/health > /dev/null 2>&1; then
+                echo "✅ New container is healthy!"
+                break
+              fi
+              echo "⏳ Health check attempt $i/20..."
+              sleep 3
+            done
+            
+            # Stop old container
+            echo "🛑 Stopping old container..."
+            docker stop portfolio-app || true
+            
+            # Remove old container
+            docker rm portfolio-app || true
+            
+            # Rename new container
+            docker rename portfolio-app-new portfolio-app
+            
+            # Update port mapping
+            docker stop portfolio-app
+            docker rm portfolio-app
+            
+            # Start with correct port
+            docker run -d \
+              --name portfolio-app \
+              --restart unless-stopped \
+              --network portfolio_net \
+              -p 3000:3000 \
+              -e NODE_ENV=${{ vars.NODE_ENV }} \
+              -e LOG_LEVEL=${{ vars.LOG_LEVEL }} \
+              -e DATABASE_URL=postgresql://portfolio_user:portfolio_pass@postgres:5432/portfolio_db?schema=public \
+              -e REDIS_URL=redis://redis:6379 \
+              -e NEXT_PUBLIC_BASE_URL="${{ vars.NEXT_PUBLIC_BASE_URL }}" \
+              -e NEXT_PUBLIC_UMAMI_URL="${{ vars.NEXT_PUBLIC_UMAMI_URL }}" \
+              -e NEXT_PUBLIC_UMAMI_WEBSITE_ID="${{ vars.NEXT_PUBLIC_UMAMI_WEBSITE_ID }}" \
+              -e MY_EMAIL="${{ vars.MY_EMAIL }}" \
+              -e MY_INFO_EMAIL="${{ vars.MY_INFO_EMAIL }}" \
+              -e MY_PASSWORD="${{ secrets.MY_PASSWORD }}" \
+              -e MY_INFO_PASSWORD="${{ secrets.MY_INFO_PASSWORD }}" \
+              -e ADMIN_BASIC_AUTH="${{ secrets.ADMIN_BASIC_AUTH }}" \
+              ${{ env.DOCKER_IMAGE }}:latest
+              
+            echo "✅ Rolling update completed!"
+          else
+            echo "🆕 Fresh deployment..."
+            docker compose up -d
+          fi
         env:
           NODE_ENV: ${{ vars.NODE_ENV }}
           LOG_LEVEL: ${{ vars.LOG_LEVEL }}