This container can be pulled via:
  docker pull registry.opensuse.org/isv/rancher/elemental/devgit/containers/suse/sl-micro/6.0/kvm-os-container:2.2.0-dev
  docker pull registry.opensuse.org/isv/rancher/elemental/devgit/containers/suse/sl-micro/6.0/kvm-os-container:2.2.0-dev-5.1
  docker pull registry.opensuse.org/isv/rancher/elemental/devgit/containers/suse/sl-micro/6.0/kvm-os-container:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.