Document or Improve the way to force the workflow to install a specific tox version.

[pllim]

tox 4.0.0 came out and things broke. Do you test against dev or pre-release version of tox?

Also see tox-dev/tox#2612

[pllim]

Also see https://tox.wiki/en/latest/faq.html#breaking-changes-in-tox-4

[Cadair]

This repo hasn't broken when tox 4 came out, what broke was the fact all the repos using it had a config file which was incompatible with tox 4 ;)

[pllim]

But is there a way for downstream to ask this workflow to use dev tox or pre-release tox?

[Cadair]

Well the way we have pinned tox would also work. Would be good to document at least, and maybe make less hacky.

[pllim]

Also please document how to install the pre-release of tox.