Github action: spell checker

[ccoVeille]

Would you like me to help you installing GitHub action?

I could suggest you using codespell, typos, or something based on vale.

These are the tools I used to help me to fix typos with #113

[mfridman]

Sure, not against it. I've used vale in the past for projects and it works nicely.

I'm not a big fan of the vale GitHub action, it's a bit too noisy. I'd prefer it fail in CI and the user has to go digging there, and leaving the PR's for code reviews.

[ccoVeille]

GitHub actions don't always create inline things in the PR