This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/leap/16.1/images/totest/images/opensuse/leap:16.1
  docker pull registry.opensuse.org/opensuse/leap/16.1/images/totest/images/opensuse/leap:16.1.3.2

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.