To do so:

1. Cut previous branch of distgit repo to create the <release>-rdo branch
   e.g: https://review.rdoproject.org/r/c/config/+/45800
2. Edit SPEC file
   e.g: https://review.rdoproject.org/r/c/rdo-infra/rdo-release/+/45805
3. Trigger CBS build

   # First build the SRPM and trigger a scratch build to test it
   $ cbs build --scratch --wait cloud9s-openstack-zed-el9s rdo-release-zed-1.el9s.src.rpm
   

   # If the scratch build is successful then trigger the final build
   $ cbs add-pkg cloud9s-openstack-zed-candidate --owner rdobuilder rdo-release
   $ cbs build --wait cloud9s-openstack-zed-el9s rdo-release-zed-1.el9s.src.rpm
   

4. Publish the RPM on repos.fedorapeople.org

   $ ssh repos.fedorapeople.org
   [PROD]$ mkdir /project/repos/openstack/openstack-zed 
   [PROD]$ cd /project/repos/openstack/openstack-zed
   [PROD]$ curl -O https://cbs.centos.org/kojifiles/work/tasks/232/3060232/rdo-release-zed-1.el9s.noarch.rpm
   [PROD]$ cp /project/repos/openstack/openstack-yoga/.htaccess /project/repos/openstack/openstack-zed/.htaccess # and edit the RewriteRule lines
   

5. Check if the RPM is available

   $ curl -L -o /dev/null https://rdoproject.org/repos/openstack-zed/rdo-release-zed.el9s.rpm