This container can be pulled via:
  docker pull registry.opensuse.org/home/dcassany/elemental/dev/teal53/media/rancher/elemental-builder-image/5.3:0.2.5
  docker pull registry.opensuse.org/home/dcassany/elemental/dev/teal53/media/rancher/elemental-builder-image/5.3:0.2.5-60.1
  docker pull registry.opensuse.org/home/dcassany/elemental/dev/teal53/media/rancher/elemental-builder-image/5.3:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.