This container can be pulled via:
  docker pull registry.opensuse.org/home/nbelouin/factorybuild/images/metallb-controller:v0.16.1
  docker pull registry.opensuse.org/home/nbelouin/factorybuild/images/metallb-controller:v0.16.1-1.3

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.