This container can be pulled via:
  docker pull registry.opensuse.org/home/defolos/bci/staging/sle-15-sp4/sle15-sp4-nvmcb/containerfile/bci/bci-kernel-module-toolkit:15.4
  docker pull registry.opensuse.org/home/defolos/bci/staging/sle-15-sp4/sle15-sp4-nvmcb/containerfile/bci/bci-kernel-module-toolkit:15.4.1.85

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.