This container can be pulled via:
  docker pull registry.opensuse.org/home/pushman/bci/cr/tumbleweed/containerfile/opensuse/kiosk-firefox:156.0
  docker pull registry.opensuse.org/home/pushman/bci/cr/tumbleweed/containerfile/opensuse/kiosk-firefox:156.0-18.84
  docker pull registry.opensuse.org/home/pushman/bci/cr/tumbleweed/containerfile/opensuse/kiosk-firefox:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.