[Maintenance] Add staging environment

app/config/config_staging.yml

@@ -0,0 +1,23 @@
+# This file is part of the Sylius package.
+# (c) Paweł Jędrzejewski
+
+imports:
+    - { resource: "config.yml" }
+
+monolog:
+    handlers:
+        main:
+            type: fingers_crossed
+            action_level: error
+            handler: nested
+        nested:
+            type: stream
+            path: "%kernel.logs_dir%/%kernel.environment%.log"
+            level: debug
+
+doctrine:
+    dbal:
+        dbname: "%database_name%_staging"
+
+swiftmailer:
+    disable_delivery: true

web/app_staging.php

@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of the Sylius package.
+ *
+ * (c) Paweł Jędrzejewski
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+use Symfony\Component\HttpFoundation\Request;
+
+/*
+ * Sylius front controller.
+ * Staging environment.
+ */
+
+require __DIR__.'/../vendor/autoload.php';
+
+$kernel = new AppKernel('staging', false);
+
+$request = Request::createFromGlobals();
+
+$response = $kernel->handle($request);
+$response->send();
+
+$kernel->terminate($request, $response);