Update build workflow to work with runner cluster (#50)

.github/workflows/build.yml

@@ -55,6 +55,9 @@ jobs:
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
+        with:
+          driver: kubernetes
+          driver-opts: namespace=buildkit
 
       - name: Build and push
         id: docker_build