This container can be pulled via:
  docker pull registry.opensuse.org/kernel/tools/images/sle_15_sp4/kbuild-gitlab:15.4
  docker pull registry.opensuse.org/kernel/tools/images/sle_15_sp4/kbuild-gitlab:15.4.16.15
  docker pull registry.opensuse.org/kernel/tools/images/sle_15_sp4/kbuild-gitlab:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.