Add moderator task.

lib/mix/tasks/make_moderator.ex

+defmodule Mix.Tasks.SetModerator do
+  use Mix.Task
+  import Mix.Ecto
+  alias Pleroma.{Repo, User}
+
+  @shortdoc "Set moderator status"
+  def run([nickname | rest]) do
+    ensure_started(Repo, [])
+
+    moderator = case rest do
+                  [moderator] -> moderator == "true"
+                  _ -> true
+                end
+
+    with %User{local: true} = user <- User.get_by_nickname(nickname) do
+      info = user.info
+      |> Map.put("is_moderator", !!moderator)
+      cng = User.info_changeset(user, %{info: info})
+      user = Repo.update!(cng)
+
+      IO.puts "Moderator status of #{nickname}: #{user.info["is_moderator"]}"
+    else
+      _ ->
+        IO.puts "No local user #{nickname}"
+    end
+  end
+end