This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/kubic/metallb-controller:0.9.5
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/kubic/metallb-controller:0.9.5-4.7
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/kubic/metallb-controller:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.