This container can be pulled via:
  docker pull registry.opensuse.org/home/steven.hardy/isv/suse/edge/factory/images/edge-image-builder:1.3.3.1
  docker pull registry.opensuse.org/home/steven.hardy/isv/suse/edge/factory/images/edge-image-builder:1.3.3.1-3.21

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.