This container can be pulled via:
  docker pull registry.opensuse.org/home/psaggu/bci-based-images/containerfile/rancher/image-build-base:1.23
  docker pull registry.opensuse.org/home/psaggu/bci-based-images/containerfile/rancher/image-build-base:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.