Perform git-related tests in different repo

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Brief

Suggestion as discussed in #167.

QA plan

1. run tests
2. change some files
3. run tests again

Note no test failure related to git-status not being pristine

Author checklist

• [x] I have QAed the functionality
• [x] The PR has a reasonably reviewable size and a meaningful commit history
• [x] I have run the branch formatter and observed no new/significative warnings
• [x] The build passes
• [x] I have self-reviewed the PR prior to assignment
• Additionally, I have code-reviewed iteratively the PR considering the following aspects in isolation:
  • [x] Correctness
  • [x] Robustness (red paths, failure handling etc)
  • [x] Test coverage
  • [ ] Spec coverage
  • [ ] Documentation
  • [x] Security
  • [x] Performance
  • [x] Breaking API changes
  • [x] Cross-compatibility (Clojure/ClojureScript)

Reviewer checklist

• [ ] I have checked out this branch and reviewed it locally, running it
• [ ] I have QAed the functionality
• [ ] I have reviewed the PR
• Additionally, I have code-reviewed iteratively the PR considering the following aspects in isolation:
  • [ ] Correctness
  • [ ] Robustness (red paths, failure handling etc)
  • [ ] Test coverage
  • [ ] Spec coverage
  • [ ] Documentation
  • [ ] Security
  • [ ] Performance
  • [ ] Breaking API changes
  • [ ] Cross-compatibility (Clojure/ClojureScript)

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@neominik I implemented your git clone suggestion, which worked like a charm. If you feel like a review, go for it !