This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/totest/containers/kubic/etcd:3.5.15-0.4.72
  docker pull registry.opensuse.org/opensuse/factory/totest/containers/kubic/etcd:3.5.15-1.4.72

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.