This container can be pulled via:
  docker pull registry.opensuse.org/devel/bci/sle-15-sp6/containerfile/bci/openjdk-devel:21
  docker pull registry.opensuse.org/devel/bci/sle-15-sp6/containerfile/bci/openjdk-devel:21.0.5.0
  docker pull registry.opensuse.org/devel/bci/sle-15-sp6/containerfile/bci/openjdk-devel:21.0.5.0-203.7
  docker pull registry.opensuse.org/devel/bci/sle-15-sp6/containerfile/bci/openjdk-devel:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.