main branch CI is not working as expected

[AucaCoyan]

Since #771 , PR CI is working properly, but main branch CI is passing... weird, I expected it to fail because there are a bunch of files that don't pass the parser check.
When I read the CI log, I found that no file was checked:

Run nu ./check-files.nu
💚 All files checked!

And after I replicate the case in my local,

use toolkit.nu *; generate-file-list --full"
checking all files...

This generate a empty list of files.

This is probably the cause:

mut $files = glob **/*.nu --exclude [before_v0.60/**]

If you remove the mut, glob fails the parser. I need to investigate how glob works

[AucaCoyan]

Reminder for later:
add a badge on the README.md so we know when the CI is passing or not