This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/rmt-server:2.16
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/rmt-server:2.16-4.56

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.