releng: use releng-secondary group instead of hostname

roles/releng/tasks/main.yml

@@ -165,7 +165,7 @@
 
 - name: symlink /srv/pungi
   file: src=/mnt/fedora_koji/compose dest=/srv/pungi  state=link
-  when: not inventory_hostname.startswith('compose-aarch64-01')
+  when: not "'releng-secondary' in group_names"
 
 - name: add pkgs for nightly compose
   yum:  state=present pkg={{ item }}