Onboard ptr1337 as Package Maintainer

Peter has previously been a Junior Package Maintainer and since the two month period is now up and his changes in the packaging ecosystem were all good so far they can be promoted as outlined in RFC 14.

---

cc @ptr1337

group_vars/all/archusers.yml

@@ -603,6 +603,7 @@ arch_users:
     email: "ptr1337@archlinux.org"
     ssh_key: ptr1337.pub
     groups:
+      - packager
       - junior-packager
   pierre:
     name: "Pierre Schmitz"