Updated CreateDatabaseCommand to create the empty database if it does not exist

module/Common/src/Doctrine/ConnectionFactory.php

@@ -0,0 +1,17 @@
+<?php
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\Common\Doctrine;
+
+use Doctrine\DBAL\Connection;
+use Doctrine\ORM\EntityManager;
+use Psr\Container\ContainerInterface;
+
+class ConnectionFactory
+{
+    public function __invoke(ContainerInterface $container): Connection
+    {
+        $em = $container->get(EntityManager::class);
+        return $em->getConnection();
+    }
+}