This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/kubic/kube-controller-manager:latest
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/kubic/kube-controller-manager:v1.31.3
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/kubic/kube-controller-manager:v1.31.3-6.45

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.