Add Gitlab CI

I added the gitlab-ci file and updated the code to the last PHPCS standard. I tried to fix the PHPStan Errors, but I don't really know what's wrong.

79 Parameter $queue of function auto_entityqueue_add_entity_to_queue()
has invalid type Drupal\entityqueue\EntityQueueInterface.
90 Call to static method loadMultiple() on an unknown class
Drupal\entityqueue\Entity\EntitySubqueue.
💡 Learn more at https://phpstan.org/user-guide/discovering-symbols
128 Call to static method loadMultipleByTargetType() on an unknown class
Drupal\entityqueue\Entity\EntityQueue.
💡 Learn more at https://phpstan.org/user-guide/discovering-symbols

All PHPCS and PHPStan error fixed

pbonnefoi → credited mglaman → .