Add Sentry

We use Sentry 7.x for now because Sentry 8.0 requires Elixir 1.10

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

lib/web/router.ex

@@ -3,6 +3,8 @@ defmodule Mobilizon.Web.Router do
   Router for mobilizon app
   """
   use Mobilizon.Web, :router
+  use Plug.ErrorHandler
+  use Sentry.Plug
 
   pipeline :graphql do
     #    plug(:accepts, ["json"])