update workflow

.github/workflows/openclaw-docker.yml

@@ -51,6 +51,7 @@ jobs:
             type=raw,value=latest,enable={{is_default_branch}}
 
       - name: Build and push Docker image
+        id: build
         uses: docker/build-push-action@v5
         with:
           context: ./docker/openclaw
@@ -59,7 +60,7 @@ jobs:
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=gha
           cache-to: type=gha,mode=max
-          platforms: linux/amd64,linux/arm64
+          platforms: linux/amd64
 
       - name: Image digest
         run: echo "Image pushed with digest ${{ steps.build.outputs.digest }}"