This container can be pulled via:
  docker pull registry.opensuse.org/home/kukuk/containerfile/mqtt-timer:1.27.0
  docker pull registry.opensuse.org/home/kukuk/containerfile/mqtt-timer:1.27.0-3.632
  docker pull registry.opensuse.org/home/kukuk/containerfile/mqtt-timer:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.