Define build directory in tests

It seems to be mandatory now.

Author: greg0ire

tests/DependencyInjection/DoctrineMigrationsExtensionTest.php

@@ -506,6 +506,7 @@ private function getContainerBuilder(): ContainerBuilder
                     'namespace' => $bundle->getNamespace(),
                 ],
             ],
+            'kernel.build_dir' => sys_get_temp_dir(),
             'kernel.cache_dir' => sys_get_temp_dir(),
             'kernel.environment' => 'test',
             'kernel.project_dir' => __DIR__ . '/../',