Add fallback Docker Buildx setup when Blacksmith fails

Author: openhands-agent

.github/workflows/build-gaia-eval-image.yml

@@ -68,7 +68,13 @@ jobs:
           echo "Updated SDK submodule to $SDK_SHA (from ${{ inputs.sdk-commit }})"
 
       - name: Set up Docker Buildx with Blacksmith
+        id: buildx-blacksmith
         uses: useblacksmith/setup-docker-builder@v1
+        continue-on-error: true
+
+      - name: Set up Docker Buildx (fallback)
+        if: steps.buildx-blacksmith.outcome == 'failure'
+        uses: docker/setup-buildx-action@v3
 
       - name: Log in to GitHub Container Registry
         uses: docker/login-action@v3