Enhance container cleanup for zero-downtime deployment

- Add comprehensive cleanup of all portfolio-app containers
- Dynamically find and remove containers with portfolio-app in name
- Remove specific problematic container names (portfolio-app-new, etc.)
- Add container pruning to clean up stopped containers
- Ensure clean environment before starting new temporary container
- Prevents any container name conflicts during deployment

.gitea/workflows/ci-cd.yml

@@ -116,7 +116,20 @@ jobs:
             
             # Clean up any existing temporary containers
             echo "🧹 Cleaning up any existing temporary containers..."
-            docker rm -f portfolio-app-new portfolio-app-temp-* || true
+            
+            # Remove specific known problematic containers
+            docker rm -f portfolio-app-new portfolio-app-temp-* portfolio-app-backup || true
+            
+            # Find and remove any containers with portfolio-app in the name (except the main one)
+            EXISTING_CONTAINERS=$(docker ps -a --format "table {{.Names}}" | grep "portfolio-app" | grep -v "^portfolio-app$" || true)
+            if [ -n "$EXISTING_CONTAINERS" ]; then
+              echo "🗑️ Removing existing portfolio-app containers:"
+              echo "$EXISTING_CONTAINERS"
+              echo "$EXISTING_CONTAINERS" | xargs -r docker rm -f || true
+            fi
+            
+            # Also clean up any stopped containers
+            docker container prune -f || true
             
             # Start new container with unique temporary name (no port mapping needed for health check)
             docker run -d \