This container can be pulled via:
  docker pull registry.opensuse.org/kernel/tools/images/sle_15_sp1/kbuild-gitlab:15.1
  docker pull registry.opensuse.org/kernel/tools/images/sle_15_sp1/kbuild-gitlab:15.1.bp151.2.2
  docker pull registry.opensuse.org/kernel/tools/images/sle_15_sp1/kbuild-gitlab:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.