Sort output by group

Not the best sorting, but better than nothing.

lib/mix/tasks/pleroma/config.ex

@@ -40,6 +40,7 @@ def run(["dump"]) do
 
       ConfigDB
       |> Repo.all()
+      |> Enum.sort()
       |> Enum.each(&dump(&1))
     else
       _ -> configdb_not_enabled()