Add RockyLinux to molecule testing

Change-Id: I5e4efdcca3692b935980fe25918de19332c52301

zuul.d/jobs.yaml

@@ -936,3 +936,12 @@
     name: openstack-ansible-deploy-hosts_lxc_overlayfs-rockylinux-9
     parent: openstack-ansible-deploy-aio
     nodeset: rockylinux-9
+
+- job:
+    name: openstack-ansible-tox-molecule-rockylinux-9
+    parent: tox-molecule
+    vars:
+      tox_environment:
+        TEST_BRANCH: "{{ zuul.branch }}"
+        DOCKER_REGISTRY: quay.io/rockylinux
+        DOCKER_IMAGE_TAG: rockylinux:9-ubi-init

zuul.d/project-templates.yaml

@@ -320,11 +320,13 @@
       jobs:
         - openstack-ansible-tox-molecule-centos-9-stream
         - openstack-ansible-tox-molecule-debian-bookworm
+        - openstack-ansible-tox-molecule-rockylinux-9
         - openstack-ansible-tox-molecule-ubuntu-jammy
     gate:
       jobs:
         - openstack-ansible-tox-molecule-centos-9-stream
         - openstack-ansible-tox-molecule-debian-bookworm
+        - openstack-ansible-tox-molecule-rockylinux-9
         - openstack-ansible-tox-molecule-ubuntu-jammy
 
 - project-template: