RoboFile with Drupal 8 / 9 bootstrapped inside

RoboFile.php

<?php

use Robo\Tasks;

use Drupal\Core\DrupalKernel;
use Symfony\Component\HttpFoundation\Request;

$GLOBALS['drupal_autoloader'] = require_once 'web/autoload.php';

/**
 * Sample RoboFile.
 */
class RoboFile extends Tasks {

    /**
   * Bootstraps Drupal 8/9 in addition to Robo.
   *
   * @throws \Exception
   */
  public function __construct() {
    if (!file_exists('web/sites/default/settings.php')) {
      // Drupal is not yet initialized, do not attempt to boot.
      return;
    }
    try {
      chdir(__DIR__ . '/web');
      $request = Request::createFromGlobals();
      $kernel = DrupalKernel::createFromRequest($request, $GLOBALS['drupal_autoloader'], 'prod');
      $kernel->handle($request);
      chdir(__DIR__);
    }
    catch (\Exception $e) {
      // Do not fail, there are several commands that do not need Drupal.
      $this->yell($e->getMessage());
    }
  }
  
  /**
   * Utilize Drupal.
   */
  public function invokeDrupal() {
    $configFactory = \Drupal::service('config.factory');
    $this->say('it works');
  }

}