This container can be pulled via:
  docker pull registry.opensuse.org/home/defolos/bci/staging/sle-15-sp5/5-1046/containerfile/suse/postfix:3.7
  docker pull registry.opensuse.org/home/defolos/bci/staging/sle-15-sp5/5-1046/containerfile/suse/postfix:3.7-1.43
  docker pull registry.opensuse.org/home/defolos/bci/staging/sle-15-sp5/5-1046/containerfile/suse/postfix:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.