Flush cache/assets when upgrading

flarum/bootstrap.php

@@ -109,6 +109,8 @@ foreach ($serviceProviders as $provider) {
 if (Core::isInstalled()) {
     $settings = $app->make('Flarum\Core\Settings\SettingsRepository');
 
+    $app->register(new \Flarum\Core\CoreServiceProvider($app));
+
     // If the version stored in the database doesn't match the version of the
     // code, then run the upgrade script (migrations). This is temporary - a
     // proper, more secure upgrade method is planned.
@@ -119,9 +121,15 @@ if (Core::isInstalled()) {
         app('Flarum\Console\UpgradeCommand')->run($input, $output);
 
         $settings->set('version', $app::VERSION);
-    }
 
-    $app->register(new \Flarum\Core\CoreServiceProvider($app));
+        app('flarum.formatter')->flush();
+
+        $forum = app('Flarum\Forum\Actions\ClientAction');
+        $forum->flushAssets();
+
+        $admin = app('Flarum\Admin\Actions\ClientAction');
+        $admin->flushAssets();
+    }
 
     $config->set('mail.driver', Core::config('mail_driver'));
     $config->set('mail.host', Core::config('mail_host'));