This container can be pulled via:
  docker pull registry.opensuse.org/isv/suse/edge/3.3/charts/upgrade-controller:303.0.0_up0.1.1
  docker pull registry.opensuse.org/isv/suse/edge/3.3/charts/upgrade-controller:303.0.0_up0.1.1-4.4

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.