This container can be pulled via:
  docker pull registry.opensuse.org/home/defolos/bci/cr/sle-15-sp7/containerfile/bci/spack:0.23
  docker pull registry.opensuse.org/home/defolos/bci/cr/sle-15-sp7/containerfile/bci/spack:0.23.1
  docker pull registry.opensuse.org/home/defolos/bci/cr/sle-15-sp7/containerfile/bci/spack:0.23.1-5.9

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.