This container can be pulled via:
  docker pull registry.opensuse.org/home/kukuk/ei-demo/container/ei-websocket-server:20200227
  docker pull registry.opensuse.org/home/kukuk/ei-demo/container/ei-websocket-server:20200227-11.268
  docker pull registry.opensuse.org/home/kukuk/ei-demo/container/ei-websocket-server:latest