Zapomenutá migrace (#959)

* disable registration

* config property

* migration added

migrations/Version20230303221015.php

@@ -0,0 +1,27 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Migrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20230303221015 extends AbstractMigration
+{
+    public function getDescription(): string
+    {
+        return '';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->abortIf($this->connection->getDatabasePlatform()->getName() !== 'mysql', 'Migration can only be executed safely on \'mysql\'.');
+
+        $this->addSql('INSERT INTO `settings` (`item`, `value`) VALUES (\'group_registration_allowed\', \'0\')');
+    }
+
+    public function down(Schema $schema): void
+    {
+    }
+}