Reduce parallelism to prevent network issues

Author: ggrossetie

.github/buildkitd.toml

@@ -0,0 +1,2 @@
+[worker.oci]
+  max-parallelism = 2

.github/workflows/release.yml

@@ -49,6 +49,8 @@ jobs:
         uses: docker/setup-qemu-action@v3
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
+        with:
+          config: .github/buildkitd.toml
       - name: Login to Docker Hub
         run: |
           echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin