+ $installerConfig = new MultiConfig( [ $configOverrides, $baseConfig ] );
+
+ // make sure we use the installer config as the main config
+ $configRegistry = $baseConfig->get( 'ConfigRegistry' );
+ $configRegistry['main'] = function() use ( $installerConfig ) {
+ return $installerConfig;
+ };
+
+ $configOverrides->set( 'ConfigRegistry', $configRegistry );
+
+ return $installerConfig;