aurweb: Skip commit validation if we are not on prod

This makes it so that you don't need to be in the list of trusted GPG keys aurweb_pgp_keys in order to start a test instance for the AUR. I think aurweb_pgp_keys should only be for people wanting to deploy this to production.

group_vars/all/archusers.yml

@@ -468,6 +468,8 @@ arch_users:
   jouke:
     name: "Jouke Witteveen"
     ssh_key: jouke.pub
+    hosts:
+      - mail.archlinux.org
     groups:
       - ""
   jsteel: