.gitlab-ci.yml: Issue #100 - Avoid installing setup.py test_requires

This avoids installing random versions of python packages from pypi when running the pytest test suite.

Closes #100 (closed)

mentioned in issue #100 (closed)

mentioned in merge request !115 (closed)

added 4 commits

• 0d4d88a9...c1c20402 - 3 commits from branch master
• a243a333 - .gitlab-ci.yml: Issue #100 (closed) - Avoid installing setup.py test_requires

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enabled an automatic merge when the pipeline for a243a333 succeeds

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