Add mysqld_exporter and podman-exporter image overrides

Add ceilometerMysqldExporterImage and edpmPodmanExporterImage fields
to the update_containers template. This allows Zuul content-provider
jobs for mysqld_exporter and prometheus-podman-exporter to override
the container images used in functional tests via the OpenStackVersion
custom resource.

Generated-By: Claude-Code claude-opus-4-6

Author: vyzigold

roles/update_containers/templates/update_containers.j2

@@ -116,6 +116,12 @@ spec:
 {% if cifmw_update_containers_edpmnodeexporterimage is defined %}
     edpmNodeExporterImage: {{ cifmw_update_containers_edpmnodeexporterimage }}
 {% endif %}
+{% if cifmw_update_containers_ceilometermysqldexporterImage is defined %}
+    ceilometerMysqldExporterImage: {{ cifmw_update_containers_ceilometermysqldexporterImage }}
+{% endif %}
+{% if cifmw_update_containers_edpmpodmanexporterImage is defined %}
+    edpmPodmanExporterImage: {{ cifmw_update_containers_edpmpodmanexporterImage }}
+{% endif %}
 {% if cifmw_update_containers_agentimage is defined %}
 	    agentImage: {{ cifmw_update_containers_registry }}/{{ cifmw_update_containers_org }}/{{ cifmw_update_containers_name_prefix }}-baremetal-operator-agent:{{ cifmw_update_containers_tag }}
 {% endif %}