🔄 fix: simplify Docker cache approach and integrate properly

.gitea/workflows/ci-cd.yaml

@@ -137,11 +137,19 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.PACKAGES_TOKEN }}
 
-      - name: Pull Docker build cache
+      - name: Set up build environment
         run: |
           IMAGE_NAME="${{ env.CI_REGISTRY }}/${{ env.GITEA_ORG }}/${{ env.GITEA_REPO }}-build-cache:${{ needs.build-cache.outputs.deps_hash }}"
-          echo "Using build cache image: $IMAGE_NAME"
-          docker pull "$IMAGE_NAME" || echo "Cache pull failed, will use regular setup"
+          echo "Build cache image: $IMAGE_NAME"
+          
+          # Try to use Docker cache if available
+          if docker pull "$IMAGE_NAME" >/dev/null 2>&1; then
+            echo "✅ Using Docker build cache"
+            echo "CACHE_AVAILABLE=true" >> $GITHUB_ENV
+          else
+            echo "⚠️  Building without cache (first run or new dependencies)"
+            echo "CACHE_AVAILABLE=false" >> $GITHUB_ENV
+          fi
 
       - name: Set up Go
         uses: actions/setup-go@v4
@@ -157,16 +165,39 @@ jobs:
         run: go install github.com/swaggo/swag/cmd/swag@latest
 
       - name: Generate Swagger Docs
-        run: cd pkg/server && go generate
+        run: |
+          if [ "${{ env.CACHE_AVAILABLE }}" = "true" ]; then
+            echo "Running in Docker cache..."
+            docker run --rm -v "$(pwd):/workspace" -w /workspace dance-lessons-coach-build-cache:latest sh -c "cd pkg/server && go generate"
+          else
+            echo "Running natively..."
+            cd pkg/server && go generate
+          fi
 
       - name: Build all packages
-        run: go build ./...
+        run: |
+          if [ "${{ env.CACHE_AVAILABLE }}" = "true" ]; then
+            echo "Running in Docker cache..."
+            docker run --rm -v "$(pwd):/workspace" -w /workspace dance-lessons-coach-build-cache:latest sh -c "go build ./..."
+          else
+            echo "Running natively..."
+            go build ./...
+          fi
 
       - name: Run tests with coverage
         run: |
-          # Run tests with coverage
-          go test ./... -coverprofile=coverage.out -v
-          go tool cover -func=coverage.out > coverage.txt
+          if [ "${{ env.CACHE_AVAILABLE }}" = "true" ]; then
+            echo "Running in Docker cache..."
+            docker run --rm \
+              -v "$(pwd):/workspace" \
+              -w /workspace \
+              dance-lessons-coach-build-cache:latest \
+              sh -c "go test ./... -coverprofile=coverage.out -v && go tool cover -func=coverage.out > coverage.txt"
+          else
+            echo "Running natively..."
+            go test ./... -coverprofile=coverage.out -v
+            go tool cover -func=coverage.out > coverage.txt
+          fi
           
           # Extract coverage percentage
           COVERAGE=$(grep "total:" coverage.txt | grep -oP '\d+\.\d+' | head -1)