This container can be pulled via:
  docker pull registry.opensuse.org/devel/bci/sle-15-sp7/containerfile/bci/openjdk:21
  docker pull registry.opensuse.org/devel/bci/sle-15-sp7/containerfile/bci/openjdk:21.0.10.0
  docker pull registry.opensuse.org/devel/bci/sle-15-sp7/containerfile/bci/openjdk:21.0.10.0-244.1

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.