try this

Author: owenjones

etc/kayobe/kolla.yml

@@ -321,7 +321,7 @@ base_centos_repo_overrides_post_yum_list: |
 stackhpc_yum_repos: |
   {% if kolla_base_distro == 'rocky' and kolla_base_distro_version == '9' %}
   {{ stackhpc_rocky_9_repos }}
-  {% elif kolla_base_distro == 'rocky' and kolla_base_distro_version == '9' %}
+  {% elif kolla_base_distro == 'rocky' and kolla_base_distro_version == '10' %}
   {{ stackhpc_rocky_10_repos }}
   {% endif %}
 

etc/kayobe/kolla/kolla-build.conf

@@ -7,8 +7,11 @@ base_tag = noble-20241118.1
 apt_preferences = {{ lookup('env', 'KAYOBE_CONFIG_PATH') }}/environments/ci-builder/builder-apt-preferences
 {# Similarly pinning to Rocky 9 minor version used in our repos #}
 {% elif kolla_base_distro == 'rocky' %}
-# TODO(owenjones): check what the best way of pulling major RL version in is
-base_tag = {{ os_release }}.{{ stackhpc_pulp_repo_rocky_9_minor_version }}
+{% if kolla_base_distro_version == '9' %}
+base_tag = 9.{{ stackhpc_pulp_repo_rocky_9_minor_version }}
+{% elif kolla_base_distro_version == '10' %}
+base_tag = 10.{{ stackhpc_pulp_repo_rocky_10_minor_version }}
+{% endif %}
 # NOTE(Alex-Welsh): rpm_setup_config is intentionally left blank to override defaults
 rpm_setup_config = 
 {% endif %}