Enable configuring OIDC storage path

[TomasTomecek]

I understand the default makes sense for desktop users. For us in Packit, our
~/.config is not writable in our deployment as k8s mounts secrets there R/O
so we cannot create new files in ~/.config (but $HOME is fine!).

Thanks to this PR, we'd get rid of this nasty hack in our codebase:
packit/packit@57cf094

[mattiaverga]

There are a couple of failures due to flake8 style checks, the Integration Tests failures should go away once you rebase to latest devel.
It would also nice to add a release note as described here.

[TomasTomecek]

This slipped b/w my fingers after I returned from my vacation.

fixed and rebased

[TomasTomecek]

The rawhide failure is unrelated:

++ git rev-parse --short HEAD
fatal: detected dubious ownership in repository at '/bodhi'
To add an exception for this directory, call:
	git config --global --add safe.directory /bodhi

BTW we got bit by that too.

[mattiaverga]

👍