This container can be pulled via:
  docker pull registry.opensuse.org/home/nbelouin/factory157/images/ironic-ipa-downloader:3.0.8
  docker pull registry.opensuse.org/home/nbelouin/factory157/images/ironic-ipa-downloader:3.0.8-4.28

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.