Add caching of pip, hatch and hatch envs in doc-tests workflow and de-duplicate the env setup

[martinhoyer]

• Adding pip cache for docs test and release actions. pre-commit action has it's own cache and in testing, there was no benefit in adding pip cache at all.

• Consolidating the html and linkcheck jobs to a single one to only run one checkout, python-setup(incl. cache) and pip install hatch.

• Adding cache action for hatch environments for docs-test.

[martinhoyer]

Argh, I can't get it to use the hash of PIPX_HOME/.cache/CACHEDIR.TAG. Cache saved with key: Linux-pipx-home- That's the last thing to figure out.

Oh and I was thinking about adding a check to only start docs-test if certain files/dirs were changes, as there are many changes in PRs that don't affect docs. I'm not confident to put together a list of dirs/files to ignore though.

[martinhoyer]

https://github.com/teemtee/tmt/pull/3241/commits/34534cc4a4bcc0d62ee645f7139cf4c780091f89 on second thought, maybe best to not have any cache for release. Since it's execution is so rare, it wouldn't be much of a benefit anyway.

[martinhoyer]

ok and the hatch installation takes 5 secs, but all packages are installed from cache.

[LecrisUT]

34534cc on second thought, maybe best to not have any cache for release. Since it's execution is so rare, it wouldn't be much of a benefit anyway.

oh yeah, that one is hatch-based also so it wouldn't do much either.

[happz]

/packit test