Merge "[CI] Always use quay.io via infra's mirror"

tests/run.yml

@@ -303,7 +303,7 @@
       set_fact:
         # NOTE(yoctozepto): no support for upgrades for now
         docker_image_tag: "{{ build_image_tag if need_build_image else (zuul.branch | basename) ~ docker_image_tag_suffix }}"
-        docker_image_prefix: "{{ 'primary:4000/lokolla/' if need_build_image else 'kolla/' }}"
+        docker_image_prefix: "{{ 'primary:4000/lokolla/' if need_build_image else '{{ zuul_site_mirror_fqdn }}:4447/openstack.kolla/' }}"
 
     # NOTE(yoctozepto): k-a octavia-certificates should run before k-a bootstrap-servers
     # because the latter hijacks /etc/kolla permissions (due to same directory on the