This container can be pulled via:
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/metallb-speaker:0.9.5
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/metallb-speaker:0.9.5-11.18
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/metallb-speaker:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.