This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/leap-micro/5.5/toolbox:12.1
  docker pull registry.opensuse.org/opensuse/leap-micro/5.5/toolbox:12.1-3.61
  docker pull registry.opensuse.org/opensuse/leap-micro/5.5/toolbox:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.