fix: set home dir to test env in gh-r tests

[vladdoster]

Description

Handles programs that create a config dir on first invocation and cluttered users $HOME dir.

Motivation and Context

Annoyed

How Has This Been Tested?

Types of changes

• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] Documentation change
• [ ] New feature (non-breaking change which adds functionality)

Checklist:

• [X] All new and existing tests passed.
• [ ] I have added tests to cover my changes.
• [ ] I have updated the documentation accordingly.

[alichtman]

How does this work when the programs go to access $HOME/their_config?

The way I typically fix this issue is by adding XDG support to the program itself.

(Cheers to working on this though. I hate when programs dump things in $HOME.)

[pschmitt]

This is just for CI testing @alichtman

[vladdoster]

@pschmitt,

It also applies when running gh-r.zunit tests locally.

[github-actions[bot]]

:tada: This PR is included in version 3.12.1 :tada:

The release is available on GitHub release

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