stream-demo/assets/example.settings.local-append.txt

$databases['default']['default'] = [
  'database' => env('MYSQL_DATABASE'),
  'username' => env('MYSQL_USER'),
  'password' => env('MYSQL_PASSWORD'),
  'host' => env('MYSQL_HOSTNAME'),
  'port' => env('MYSQL_PORT'),
  'driver' => 'mysql',
  'prefix' => '',
  'collation' => 'utf8mb4_general_ci',
];

$settings['config_sync_directory'] = '../config/sync';
$settings['hash_salt'] = env('DRUPAL_SALT');

$config['simple_message.config']['message'] = 'Hello stream!';