add buildx setup

Author: brosner

.github/workflows/ci.yml

@@ -74,6 +74,8 @@ jobs:
             type=ref,event=branch
             type=ref,event=pr
             type=sha
+      - name: Setup docker buildx
+        uses: docker/setup-buildx-action@v3
       - name: Build image
         uses: docker/build-push-action@v5
         if: github.ref == 'refs/heads/main'