feat(radius): Add the user to the correct group

When generating the first WiFi password, the user is added to the
`radius_access` group, which will allow them to connect. This also fix a
previous incorrect logic where users without wifi password could not
generate one.

src/dgsi/views.py

@@ -83,9 +83,12 @@ class GenerateWiFiPasswordView(LoginRequiredMixin, RedirectView):
 
         if user.kanidm is None:
             messages.error(self.request, _("Compte DGNum inexistant."))
-        elif not user.kanidm.radius_secret:
-            messages.error(self.request, _("Mot de passe WiFi déjà existant."))
         else:
+            # Give access to the wifi network when the user creates its first password
+            if not user.kanidm.radius_secret:
+                async_to_sync(klient.group_add_members)(
+                    "radius_access", [user.username]
+                )
             async_to_sync(klient.call_post)(f"/v1/person/{user.username}/_radius")
 
         return super().get(request, *args, **kwargs)