This container can be pulled via:
  docker pull registry.opensuse.org/home/dcassany/elemental/dev/teal53/media/rancher/seedimage-builder/5.3:1.2.2
  docker pull registry.opensuse.org/home/dcassany/elemental/dev/teal53/media/rancher/seedimage-builder/5.3:1.2.2-14.1
  docker pull registry.opensuse.org/home/dcassany/elemental/dev/teal53/media/rancher/seedimage-builder/5.3:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.