Add messaging-rabbitmq-4 repo to content provider job

The openstack-rabbitmq container image needs RabbitMQ 4.x from the
CentOS Messaging SIG repo. Without this, container builds pick up
RabbitMQ 3.9.x from the default repos, causing deployment failures
in downstream CI jobs.

Configure cifmw_repo_setup_extra_repos on the
openstack-meta-content-provider job so the messaging-rabbitmq-4 repo
is available during container image builds. Uses
ansible_distribution_major_version to support both CentOS 9 and 10.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Signed-off-by: Luca Miccini <lmiccini@redhat.com>

Author: lmiccini

zuul.d/content_provider.yaml

@@ -18,6 +18,8 @@
           centos10:
             - tempest-extras
         master: *exclude
+      cifmw_repo_setup_extra_repos:
+        - "messaging-rabbitmq-4,baseurl=https://mirror.stream.centos.org/SIGs/{{ ansible_distribution_major_version }}-stream/messaging/x86_64/rabbitmq-4/"
     pre-run:
       - ci/playbooks/meta_content_provider/copy_container_files.yaml
     run: