Update reset token to warning

app/views/admin/runners/index.html.haml

@@ -35,7 +35,7 @@
         You can reset runners registration token by pressing a button below.
       .prepend-top-10
         = button_to _("Reset runners registration token"), reset_runners_token_admin_application_settings_path,
-          method: :put, class: 'btn btn-default',
+          method: :put, class: 'btn btn-warning',
           data: { confirm: _("Are you sure you want to reset registration token?") }
 
   = render partial: 'ci/runner/how_to_setup_shared_runner',