This fixes <https://odoo.itopie.ch/web#model=helpdesk.ticket&id=HT00993>.

Thanks to Michel Lortie <mlortie@itopie.ch> for the help.

installation/nextcloud_itopie.md

@@ -1430,7 +1430,8 @@ Administration settings
    Nextcloud Office
     Use your own server: https://office.inubo.ch
    Advanced settings
-    Allow list for WOPI requests: ${INTERNAL_IP_office.inubo.ch}
+    Allow list for WOPI requests: $(host office.inubo.ch | \
+                                     awk '{print $NF}')
 ```
 
 A installer par défaut.