Patch: Correct checkout hang and permission issues for forked PRs.

[mirsdemo]

The previous workflow used github.head_ref, causing the CI to hang or fail on forked PRs, as it couldn't correctly resolve branch names across repositories. It also struggled with permission errors when trying to push back to contributors' forks.

This PR addresses and refactors the Generated Files workflow into a post-merge version cleaner model:

• Switched to on: push -> main. This ensures the automation only runs once code has been merged.
• By running directly on the base repository, we eliminate cross-repository permission errors, and the significant checkout hang.
• Keeping this ensures that the README.md and filelist.json files are always in synchronization with the latest code on main, even if a contributor forgets to update them locally.

I verified on forks that the scripts executed successfully and that the bot can push the commit directly to the repository without authentication hurdles! :D

[IsraeliDaniel]

Any update? Waiting to be able to pass tests <3