This container can be pulled via:
  docker pull registry.opensuse.org/isv/rancher/elemental/staging/teal53/media/rancher/seedimage-builder:1.3.4
  docker pull registry.opensuse.org/isv/rancher/elemental/staging/teal53/media/rancher/seedimage-builder:1.3.4-10.44
  docker pull registry.opensuse.org/isv/rancher/elemental/staging/teal53/media/rancher/seedimage-builder:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.