This container can be pulled via:
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/metallb-speaker:0.8.3
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/metallb-speaker:0.8.3-5.523
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/metallb-speaker:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.