This container can be pulled via:
  docker pull registry.opensuse.org/isv/rancher/elemental/pr/rancher/elemental-operator/pr-842/containers/rancher/seedimage-builder:1.7.0
  docker pull registry.opensuse.org/isv/rancher/elemental/pr/rancher/elemental-operator/pr-842/containers/rancher/seedimage-builder:1.7.0-220.5
  docker pull registry.opensuse.org/isv/rancher/elemental/pr/rancher/elemental-operator/pr-842/containers/rancher/seedimage-builder:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.