Feature request: headless mode for check-all

[Gravifer]

I am trying to use check-all in CI, but the process would exit with errno 1; this is because the subcommand is designed to be human-friendly, and will just abort if it cannot generate the visualization https://github.com/rust-lang/rustlings/blob/b5d440fdc3a1fadad6dc6196dad2acddabdc671f/src/app_state.rs#L413

Perhaps in check_all_exercises_impl we can revert to a basic synchronous procedure should terminal::size().context("Failed to get the terminal size")? have went the sad path.

I just finished the track and deeply appreciate everything that the contributors have put their hard work into. Wish all the best for rustlings (and rustacean wannabes like me)!

[mo8it]

Why do you want to do the checks in a CI?

[Gravifer]

The idea was to make sure my solutions are still valid with each new Rust nightly; that way I would know that perhaps it's time for me to renew my understanding of the language basics. (just a thought)