SaveEntity.php

<?php

namespace Drupal\action_test\Plugin\Action;

use Drupal\Core\Action\ActionBase;
use Drupal\Core\Session\AccountInterface;

/**
 * Provides an operation to save user entities.
 *
 * @Action(
 *   id = "action_test_save_entity",
 *   label = @Translation("Saves entities"),
 *   type = "user"
 * )
 */
class SaveEntity extends ActionBase {
    
    /**
     * {@inheritdoc}
     */
    public function execute($entity = NULL) {
        $entity->save();
    }
    
    /**
     * {@inheritdoc}
     */
    public function access($object, AccountInterface $account = NULL, $return_as_object = FALSE) {
        
        /** @var \Drupal\Core\Entity\EntityInterface $object */
        return $object->access('update', $account, $return_as_object);
    }

}