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/+/52518
2. Edit SPEC file
   e.g: https://review.rdoproject.org/r/c/rdo-infra/rdo-release/+/52519
3. Trigger CBS build

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

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

1. Create the redirects in trunk.rdoproject.org to point to the cbs builds both for rdo-release-<release_name> and rdo-release-<release_identifier>
   e.g: https://softwarefactory-project.io/r/c/software-factory/sf-infra/+/32391
2. Check if the RPM is available

   $ curl -L -o /dev/null https://trunk.rdoproject.org/rdo_release/openstack-caracal/rdo-release-caracal.el9s.rpm
   $ curl -L -o /dev/null https://trunk.rdoproject.org/rdo_release/openstack-2024.1/rdo-caracal-2024.1.el9s.rpm 

[1] https://review.opendev.org/c/openstack/devstack/+/930913