This is for testing purposes
https://www.digitalocean.com/community/tutorials/docker-explained-using-dockerfiles-to-automate-building-of-images http://bencane.com/2016/01/11/using-travis-ci-to-test-docker-builds/ https://techoverflow.net/2013/10/22/docker-remove-all-images-and-containers/
to clear caches in database http://localhost/update.php