This container can be pulled via:
  docker pull registry.opensuse.org/devel/caasp/kubic-container/container/kubic/default-http-backend:0.15
  docker pull registry.opensuse.org/devel/caasp/kubic-container/container/kubic/default-http-backend:0.15.0
  docker pull registry.opensuse.org/devel/caasp/kubic-container/container/kubic/default-http-backend:0.15.0-5.42

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.