Make Docker mandatory for pre-push hook

- Docker must be running and functional before push is allowed
- Added comprehensive Docker status checks (info + hello-world test)
- Enhanced error messages with platform-specific Docker start instructions
- Improved build error reporting with detailed log output
- Added common troubleshooting tips for Docker build failures
- Push will fail if Docker is not available or build fails

.githooks/pre-push

@@ -139,20 +139,52 @@ if [ "$CURRENT_BRANCH" = "production" ]; then
         print_warning "No .env file found. Make sure secrets are configured in Gitea."
     fi
     
-    # Check if Docker is running
+    # Check if Docker is running and ready
+    print_status "Checking Docker status..."
     if ! docker info > /dev/null 2>&1; then
-        print_warning "Docker is not running. Skipping Docker build test."
+        print_error "Docker is not running! Please start Docker before pushing."
+        print_status "To start Docker:"
+        print_status "  - macOS: Open Docker Desktop application"
+        print_status "  - Linux: sudo systemctl start docker"
+        print_status "  - Windows: Start Docker Desktop application"
+        print_status ""
+        print_status "Wait for Docker to fully start before trying again."
+        exit 1
+    fi
+    
+    # Test Docker functionality
+    if ! docker run --rm hello-world > /dev/null 2>&1; then
+        print_error "Docker is running but not functional!"
+        print_status "Docker might still be starting up. Please wait and try again."
+        print_status "Or restart Docker if the issue persists."
+        exit 1
+    fi
+    
+    print_success "Docker is running and functional"
+    
+    # Check Docker image can be built
+    print_status "Testing Docker build..."
+    
+    # Create a temporary log file for build output
+    BUILD_LOG=$(mktemp)
+    
+    if docker build -t portfolio-app:test . > "$BUILD_LOG" 2>&1; then
+        print_success "Docker build test passed"
+        docker rmi portfolio-app:test > /dev/null 2>&1
+        rm -f "$BUILD_LOG"
     else
-        # Check Docker image can be built
-        print_status "Testing Docker build..."
-        if docker build -t portfolio-app:test . > /dev/null 2>&1; then
-            print_success "Docker build test passed"
-            docker rmi portfolio-app:test > /dev/null 2>&1
-        else
-            print_warning "Docker build test failed, but continuing..."
-            # Don't fail the push for Docker build issues in pre-push hook
-            # The CI/CD pipeline will catch this
-        fi
+        print_error "Docker build test failed!"
+        print_status "Build errors:"
+        echo "----------------------------------------"
+        cat "$BUILD_LOG"
+        echo "----------------------------------------"
+        print_status "Please fix Docker build issues before pushing."
+        print_status "Common issues:"
+        print_status "  - Missing files referenced in Dockerfile"
+        print_status "  - Network issues during npm install"
+        print_status "  - Insufficient disk space"
+        rm -f "$BUILD_LOG"
+        exit 1
     fi
 fi