This container can be pulled via:
  docker pull registry.opensuse.org/home/kzhelyazkov/metallb-images/containerfile/suse/frr:8.4
  docker pull registry.opensuse.org/home/kzhelyazkov/metallb-images/containerfile/suse/frr:8.4-150500.4.3.1
  docker pull registry.opensuse.org/home/kzhelyazkov/metallb-images/containerfile/suse/frr:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.