This container can be pulled via:
  docker pull registry.opensuse.org/home/nbelouin/factorynmctest/images/metallb-speaker:v0.14.9
  docker pull registry.opensuse.org/home/nbelouin/factorynmctest/images/metallb-speaker:v0.14.9-1.12

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.