totalsport/bootstrap/common/config.php

<?php
return [
  'urls.base' => getenv('BASE_URL'),
  'folders.base' => dirname(__DIR__, 2),
  'folders.resources' => DI\string(implode(DIRECTORY_SEPARATOR, [
    '{folders.base}',
    'resources'
  ])),
  'folders.routes' => DI\string(implode(DIRECTORY_SEPARATOR, [
    '{folders.resources}',
    'routes'
  ])),
  'folders.images' => DI\string(implode(DIRECTORY_SEPARATOR, [
    '{folders.base}',
    'public',
    'assets',
    'images'
  ]))
];