This container can be pulled via:
  docker pull registry.opensuse.org/home/ppavlu/infra/containers/book:0.0.0
  docker pull registry.opensuse.org/home/ppavlu/infra/containers/book:0.0.0-12.418
  docker pull registry.opensuse.org/home/ppavlu/infra/containers/book:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.