This container can be pulled via:
  docker pull registry.opensuse.org/kubic/kube-controller-manager:latest
  docker pull registry.opensuse.org/kubic/kube-controller-manager:v1.31.1
  docker pull registry.opensuse.org/kubic/kube-controller-manager:v1.31.1-5.38

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.