This container can be pulled via:
  docker pull registry.opensuse.org/devel/kubic/ei-demo/container/ei-websocket-server:20191217
  docker pull registry.opensuse.org/devel/kubic/ei-demo/container/ei-websocket-server:20191217-7.29
  docker pull registry.opensuse.org/devel/kubic/ei-demo/container/ei-websocket-server:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.