Add ArchLinux mirror

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

group_vars/mirror_backend.yml

@@ -68,6 +68,11 @@ glob_rsync_mirror:
       cron_time: "00 5"
       rsync_host: cdimage.ubuntu.com
       rsync_path: cdimage/ubuntu-mate/releases
+    - name: archlinux
+      dest: archlinux
+      cron_time: "08 3"
+      rsync_host: archlinux.polymorf.fr
+      rsync_path: archlinux/
 
 glob_apt_mirror:
   root: /mirror/pub