This container can be pulled via:
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/kube-proxy:v1.30.6
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/kube-proxy:v1.30.6-12.187

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.