Allow for Psalm and ECS to run on all builds

ecs.php

@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
+
+return static function (ContainerConfigurator $containerConfigurator): void {
+    $containerConfigurator->import(__DIR__ . '/vendor/sylius-labs/coding-standard/ecs.php');
+};