Sync repository with cs-pub-ro organization

[gabrielmocanu]

Since cs-pub-ro/operating-systems repository will be improved during the semester, we need a way to sync this repository with cs-pub-ro/operating-systems.
We need to create a GH Action that periodically(once a week) checks cs-pub-ro/operating-systems for updates and create a PR (if possible with each commit) in this repository.
An action that can be used for that may be fork-sync.

This action needs to be tested also with other repositories.
For example:

1. Create a dummy repo with this GH Action
2. Fork it
3. Update the fork
4. Check if this action runs properly