This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/leap/15.1/images/totest/containers/opensuse/leap:15.1
  docker pull registry.opensuse.org/opensuse/leap/15.1/images/totest/containers/opensuse/leap:15.1.2.1

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.