This container can be pulled via:
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/etcd:3.4.3
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/etcd:3.4.3-0
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/etcd:3.4.3-0.10.326
  docker pull registry.opensuse.org/devel/kubic/containers/container/kubic/etcd:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.