drupal-starterkit-profile/figli_starter_kit.install

<?php

/**
 * @file
 * Install, update and uninstall hooks for the figli starter kit install profile.
 */

use Drupal\user\Entity\User;

/**
 * Implements hook_install().
 *
 * Perform actions to set up the site for this profile.
 *
 * @see system_install()
 */
function figli_starter_kit_install() {
  // Add code here to make nodes, terms, etc.
  // Assign user 1 the "administrator" role.
  $user = User::load(1);
  $user->roles[] = 'root';
  $user->save();

  // Don't do anything else during config sync.
  if (\Drupal::isConfigSyncing()) {
    return;
  }
}