Onboard carsme as Package Maintainer

Carsme has previously been a Junior Package Maintainer, but the two
month period is now up and their changes all looked good.

Related to #579



Signed-off-by: Christian Heusel <christian@heusel.eu>

group_vars/all/archusers.yml

@@ -223,6 +223,7 @@ arch_users:
     email: "carsme@archlinux.org"
     ssh_key: carsme.pub
     groups:
+      - packager
       - junior-packager
   cbehan:
     name: "Connor Behan"