This container can be pulled via:
  docker pull registry.opensuse.org/home/tbechtold/openstack-containers/j2gen/sle_15_sp1/images/memcached:1.5.6
  docker pull registry.opensuse.org/home/tbechtold/openstack-containers/j2gen/sle_15_sp1/images/memcached:1.5.6-5.1
  docker pull registry.opensuse.org/home/tbechtold/openstack-containers/j2gen/sle_15_sp1/images/memcached:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.