Allow to use Mix tasks inside Releases

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

lib/mix/tasks/mobilizon/groups.ex

@@ -6,12 +6,13 @@ defmodule Mix.Tasks.Mobilizon.Groups do
   use Mix.Task
 
   alias Mix.Tasks
+  import Mix.Tasks.Mobilizon.Common
 
   @shortdoc "Manages Mobilizon groups"
 
   @impl Mix.Task
   def run(_) do
-    Mix.shell().info("\nAvailable tasks:")
+    shell_info("\nAvailable tasks:")
     Tasks.Help.run(["--search", "mobilizon.groups."])
   end
 end