Upgrade the database on page load if necessary

flarum/bootstrap.php

@@ -107,6 +107,20 @@ foreach ($serviceProviders as $provider) {
 }
 
 if (Core::isInstalled()) {
+    $settings = $app->make('Flarum\Core\Settings\SettingsRepository');
+
+    // If the version stored in the database doesn't match the version of the
+    // code, then run the upgrade script (migrations). This is temporary - a
+    // proper, more secure upgrade method is planned.
+    if ($settings->get('version') !== $app::VERSION) {
+        $input = new \Symfony\Component\Console\Input\StringInput('');
+        $output = new \Symfony\Component\Console\Output\BufferedOutput;
+
+        app('Flarum\Console\UpgradeCommand')->run($input, $output);
+
+        $settings->set('version', $app::VERSION);
+    }
+
     $app->register(new \Flarum\Core\CoreServiceProvider($app));
 
     $config->set('mail.driver', Core::config('mail_driver'));