This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/powerpc/totest/containers/kubic/kube-controller-manager:v1.28.15
  docker pull registry.opensuse.org/opensuse/factory/powerpc/totest/containers/kubic/kube-controller-manager:v1.28.15-2.57

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.