modificaciones-settings.php

// En Settings.php
$local_settings = __DIR__ . "/settings.local.php";
if (file_exists($local_settings)) {
  include $local_settings;
}

if (empty($settings['hash_salt'])) {
  $settings['hash_salt'] = hash('sha256', serialize($databases));
}

// En settings.local.php
<?php
$databases['default']['default'] = array(
  'driver' => 'mysql',
  'database' => 'database',
  'username' => 'username',
  'password' => 'password',
  'host' => 'localhost',
  'prefix' => '', 
);