ci: add debugging and force rebuild of Docker images

- Add ls -la to show build-artifacts/docker/ contents
- Add file command to verify binary type
- Add --no-cache to docker compose build to prevent stale cache issues
- Ensures fresh build with current binary

.github/workflows/spark-integration-tests.yml

@@ -128,15 +128,18 @@ jobs:
     - name: Prepare SeaweedFS binary
       run: |
         echo "Copying SeaweedFS binary to docker directory..."
+        ls -la build-artifacts/docker/
         cp build-artifacts/docker/weed docker/
         chmod +x docker/weed
         ls -la docker/weed
+        file docker/weed
         echo "✓ Binary is ready"
 
     - name: Start SeaweedFS services
       working-directory: test/java/spark
       run: |
         echo "Starting SeaweedFS with Docker Compose..."
+        docker compose build --no-cache
         docker compose up -d seaweedfs-master seaweedfs-volume seaweedfs-filer
         
         echo "Waiting for SeaweedFS filer to be ready..."