Auto deploy from GitLab to server

Hello!

I’ve been looking around how I can achieve the functionality that when I push changed into my gitlab account (gitlab.com) it will automatically will update my server’s files.

I’ve read this article: https://www.digitalocean.com/community/tutorials/how-to-set-up-automatic-deployment-with-git-with-a-vps

But this article lets me push to my server and not push it to gitlab.com and then it will automatically push the changed to my server.

How can I do that whenever I push changed to my gitlab.com account it will automatically push those changes to my droplet?