With MediaWiki master and ReadingLists extension, when I run the installer with `install.php --with-extensions` the install dies:
```
Creating main page with default content
done
Creating tables for enabled extensions
[2edde77b0e3b7c7ba288782b] [no req] ConfigException from line 136 of includes/config/ConfigFactory.php: No registered builder available for ReadingLists.
Backtrace:
#0 extensions/ReadingLists/src/Utils.php(40): ConfigFactory->makeConfig(string)
#1 extensions/ReadingLists/src/HookHandler.php(43): MediaWiki\Extensions\ReadingLists\Utils::isCentralWiki(MediaWiki\MediaWikiServices)
#2 includes/Hooks.php(174): MediaWiki\Extensions\ReadingLists\HookHandler::onLoadExtensionSchemaUpdates(MysqlUpdater)
#3 includes/Hooks.php(202): Hooks::callHook(string, array, array, NULL)
#4 includes/installer/DatabaseUpdater.php(127): Hooks::run(string, array)
#5 includes/installer/DatabaseUpdater.php(192): DatabaseUpdater->__construct(Wikimedia\Rdbms\DatabaseMysqli, boolean, NULL)
#6 includes/installer/DatabaseInstaller.php(312): DatabaseUpdater::newForDB(Wikimedia\Rdbms\DatabaseMysqli)
#7 includes/installer/Installer.php(1544): DatabaseInstaller->createExtensionTables(MysqlInstaller)
#8 includes/installer/CliInstaller.php(137): Installer->performInstallation(array, array)
#9 maintenance/install.php(125): CliInstaller->execute()
#10 maintenance/doMaintenance.php(94): CommandLineInstaller->execute()
#11 maintenance/install.php(175): require_once(string)
#12 {main}
```
The #GoogleLogin has the same issue and T196173 has a bit more details. Namely that when the installer runs the `LoadExtensionSchemaUpdates` hook, the extension registry configuration is intentionally NOT loaded.
To reproduce on CI: comment `check experimental` on a change made to ReadingLists. A job containing "quibble" will fail with the issue.