This container can be pulled via:
  docker pull registry.opensuse.org/isv/suse/edge/factory/devel/images/upgrade-controller:0.1.1
  docker pull registry.opensuse.org/isv/suse/edge/factory/devel/images/upgrade-controller:0.1.1-2.26

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.