hi @no_one (and your friend),
there is no direct feature on Glitch yet (Glitch Feature Ideas?) where a glitch repo gets updated whenever a github repo is updated. however, there are indirect methods to do this:
or if you’re interested, there’s a whole article by glitch on automating a github-glitch workflow that achieves what you want plus more, with the usage of github actions (based on the idea that every glitch project is also a github repository): Automating My Deploys From GitHub to Glitch - DEV Community