blubb.install

/**
 * Implements hook_install().
 *
 * Performs actions to set up the site for this profile.
 *
 * @see system_install()
 */
function blubb_install() {
  global $config_directories;

  $sync_directory = '../config/sync';

  // Create a source storage that reads from sync.
  $file_storage = new \Drupal\Core\Config\FileStorage($sync_directory);

  // Match up the site uuids.
  $system_site = $file_storage->read('system.site');
  if (isset($system_site['uuid'])) {
    \Drupal::configFactory()
      ->getEditable('system.site')
      ->set('uuid', $system_site['uuid'])
      ->save();
  }

  // Update settings.php.
  $settings['config_directories']['sync'] = (object) [
    'value' => $sync_directory,
    'required' => TRUE,
  ];

  drupal_rewrite_settings($settings);
  $config_directories['sync'] = $sync_directory;

  $languages = $file_storage->listAll('language.entity.');
  foreach ($languages as $id) {
    $language = $file_storage->read($id);
    $config = \Drupal::configFactory()->getEditable($id);
    $config->setData($language);
    $config->save();
  }
}

./vendor/bin/drush site-install --yes blubb --db-url="$SIMPLETEST_DB" --config-dir=$(pwd)/config/sync