This container can be pulled via:
  docker pull registry.opensuse.org/home/favogt/releasetest/containers/containers/opensuse/tumbleweed:20190112
  docker pull registry.opensuse.org/home/favogt/releasetest/containers/containers/opensuse/tumbleweed:20190112.25.1

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.