This container can be pulled via:
  docker pull registry.opensuse.org/home/defolos/bci/staging/sle-15-sp6/sle15-sp6-pygts/containerfile/suse/spack:0.21
  docker pull registry.opensuse.org/home/defolos/bci/staging/sle-15-sp6/sle15-sp6-pygts/containerfile/suse/spack:0.21-1.183
  docker pull registry.opensuse.org/home/defolos/bci/staging/sle-15-sp6/sle15-sp6-pygts/containerfile/suse/spack:0.21.2
  docker pull registry.opensuse.org/home/defolos/bci/staging/sle-15-sp6/sle15-sp6-pygts/containerfile/suse/spack:0.21.2-1.183

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.