public function postInstall() {
    // Sample method code with instructions for use.
    $this->say("The post:install command should be customized per project. Copy the postInstall() method from the `/vendor/robo-drupal/src/Tasks.php` folder into your RoboFile.php file and alter it to suit your needs.");
    return TRUE;

    // Code you'll want to use starts below.
    $terminus_site_env  = $this->getPantheonSiteEnv();
    $project_properties = $this->getProjectProperties();
    $pantheon_prefix    = getenv('TERMINUS_SITE');
    $needs_directory    = FALSE;
    // These are the remote domains we want to run the migration on.
    $install_domains = [
      $pantheon_prefix . '.develop',
      $pantheon_prefix . '.dev',
    ];

    if ((in_array($terminus_site_env, $install_domains)) && getenv('CIRCLECI')) {
      $cmd_prefix = "terminus remote:drush $terminus_site_env --";
      $needs_directory = FALSE;
    }
    elseif (!getenv('CIRCLECI')) {
      $cmd_prefix = "drush";
      $needs_directory = TRUE;
    }
    if (!isset($cmd_prefix)) {
      return;
    }
    if (in_array($terminus_site_env, $install_domains)) {
      $drush_commands = [
        'wake_old_multidev' => "terminus env:wake wfw8.d7database",
        'drush_create_admin' => "$cmd_prefix ucrt admin@test.org --mail=admin@test.org --password=admin",
        'drush_assign_admin' => "$cmd_prefix urol administrator --mail=admin@test.org",
        'drush_migrate_prep' => "$cmd_prefix mim --group=migrate_drupal_7 --limit=50",
      ];
      // Run the commands you listed.
      $query = $this->taskExec(implode(' && ', $drush_commands));
      if ($needs_directory) {
        $query->dir($project_properties['web_root']);
      }
      $query->run();
    }
  }