archusers: Restrict fukawi2 to the mail.al.org host

Looks like a oversight when he was offboarded as DevOps.
As support staff he shouldn't have access to

group_vars/all/archusers.yml

@@ -240,7 +240,10 @@ arch_users:
   fukawi2:
     name: "Phillip Smith"
     ssh_key: fukawi2.pub
-    groups: []
+    hosts:
+      - mail.archlinux.org
+    groups:
+      - support-staff
   gitlab:
     name: ""
     groups: []