fix(ci): try accessing host Docker daemon directly

- Remove container spec and DinD service
- Try to access host Docker daemon via various endpoints
- Test unix:///var/run/docker.sock, TCP localhost, Docker bridge
- This bypasses network isolation issues
- If this works, we can use Buildx in next step

.forgejo/workflows/lint-and-build.yml

@@ -95,49 +95,45 @@ jobs:
         run: cargo build --release --verbose
 
   # ==============================================================================
-  # Job 4: Docker Build with Buildx - Using runs-on: docker without container
+  # Job 4: Docker Build - Try accessing host Docker via DOCKER_HOST
   # ==============================================================================
   docker-build:
     runs-on: docker
-    # No container - should have direct Docker access
     needs: [build]
     
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
       
-      - name: Verify Docker is available
+      - name: Try accessing Docker
         run: |
-          docker version
-          docker info
+          echo "Checking Docker availability..."
+          # Try various Docker host options
+          if docker info >/dev/null 2>&1; then
+            echo "✅ Docker accessible via default socket"
+          elif docker -H unix:///var/run/docker.sock info >/dev/null 2>&1; then
+            echo "✅ Docker accessible via /var/run/docker.sock"
+            export DOCKER_HOST=unix:///var/run/docker.sock
+          elif docker -H tcp://127.0.0.1:2375 info >/dev/null 2>&1; then
+            echo "✅ Docker accessible via TCP localhost"
+            export DOCKER_HOST=tcp://127.0.0.1:2375
+          elif docker -H tcp://172.17.0.1:2375 info >/dev/null 2>&1; then
+            echo "✅ Docker accessible via Docker bridge"
+            export DOCKER_HOST=tcp://172.17.0.1:2375
+          else
+            echo "❌ Docker not accessible"
+            echo "Available network interfaces:"
+            ip addr show
+            exit 1
+          fi
       
-      - name: Set up Docker Buildx
-        run: |
-          docker buildx version
-          docker buildx create --use --name builder
-          docker buildx inspect --bootstrap
+      - name: Show Docker version
+        run: docker version
       
-      - name: Build Docker image with Buildx
+      - name: Build Docker image
         working-directory: ./backend
         run: |
-          docker buildx build \
-            --file docker/Dockerfile \
-            --tag normogen-backend:${{ github.sha }} \
-            --tag normogen-backend:latest \
-            --cache-from type=local,src=/tmp/.buildx-cache \
-            --cache-to type=local,dest=/tmp/.buildx-cache-new,mode=max \
-            --load \
-            .
-          
-          # Rotate cache
-          rm -rf /tmp/.buildx-cache
-          mv /tmp/.buildx-cache-new /tmp/.buildx-cache || true
+          docker build -f docker/Dockerfile -t normogen-backend:${{ github.sha }} -t normogen-backend:latest .
       
-      - name: Test Docker image
-        run: |
-          docker run --rm normogen-backend:${{ github.sha }} ls -la /app/normogen-backend || echo "Binary check"
-      
-      - name: Show image info
-        run: |
-          docker images normogen-backend
-          docker inspect normogen-backend:${{ github.sha }} || echo "Image inspect"
+      - name: Show images
+        run: docker images normogen-backend