How to make an update on your template?

Question

WordPress

Good afternoon. There was such a question. How to make it so that the client can update the template with my edits through his admin panel. Those. I made some changes to the template, and the client took and updated the template.

Answer 1

I have configured via Gitlab and plugin https://wppusher.com/

Answer 2

And how does wordpress actually understand that there is an update, what cron functions are responsible for this, and where (on what link) does it knock to check?