4x-centos-9-medium

• github.com/openstack-k8s-operators/ci-frameworkrdoproject.org
  github.com/openstack-k8s-operators/ci-framework/blob/18.0.0-proposed/zuul.d/nodeset.yaml
• github.com/openstack-k8s-operators/ci-frameworkrdoproject.org
  github.com/openstack-k8s-operators/ci-framework/blob/main/zuul.d/nodeset.yaml