Allows you to get values for read only settings that are stored in settings.php (drush 9.3 and newer)
composer require nymedia/drupal_settings
Imagine we have a settings.local.php that includes this:
$settings['environment'] = 'development';
Now maybe we want to get ahold of this value in a bash script, or a composer script. We could just go ahead and use this package:
drush setting:get environment