Onboard alerque as new TU

Ref #373 (closed)

group_vars/all/archusers.yml

@@ -31,6 +31,11 @@ arch_users:
     ssh_key: alad.pub
     groups:
       - tu
+  alerque:
+    name: "Caleb Maclennan"
+    ssh_key: alerque.pub
+    groups:
+      - tu
   allan:
     name: "Allan McRae"
     ssh_key: allan.pub