This container can be pulled via:
  docker pull registry.opensuse.org/devel/kubic/containers/container_arm/kubic/kube-controller-manager:v1.18.12
  docker pull registry.opensuse.org/devel/kubic/containers/container_arm/kubic/kube-controller-manager:v1.18.12-6.714

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.