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>

config/config.exs

@@ -112,6 +112,7 @@ config :mobilizon, Mobilizon.Web.Email.Mailer,
 
 # Configures Elixir's Logger
 config :logger, :console,
+  backends: [:console, Sentry.LoggerBackend],
   format: "$time $metadata[$level] $message\n",
   metadata: [:request_id]