docker file openclaw path fix

Author: acardoco

.github/workflows/build-openclaw.yml

@@ -49,7 +49,7 @@ jobs:
         uses: docker/build-push-action@v6
         with:
           context: .
-          file: ./Dockerfile
+          file: .kubernetes/openclaw/Dockerfile.openclaw
           push: true
           platforms: linux/amd64
           tags: ${{ steps.meta.outputs.tags }}