AddRoleUser.php

<?php

namespace Drupal\user\Plugin\Action;

use Drupal\Core\Action\Attribute\Action;
use Drupal\Core\StringTranslation\TranslatableMarkup;

/**
 * Adds a role to a user.
 */
class AddRoleUser extends ChangeUserRoleBase {
    
    /**
     * {@inheritdoc}
     */
    public function execute($account = NULL) {
        $rid = $this->configuration['rid'];
        // Skip adding the role to the user if they already have it.
        if ($account !== FALSE && !$account->hasRole($rid)) {
            // For efficiency manually save the original account before applying
            // any changes.
            $account->original = clone $account;
            $account->addRole($rid)
                ->save();
        }
    }

}