Use GitHub Actions. Drop 3.4, 3.5, PyPy2

[mauritsvanrees]

No description provided.

[mister-roboto]

@mauritsvanrees thanks for creating this Pull Request and help improve Plone!

To ensure that these changes do not break other parts of Plone, the Plone test suite matrix needs to pass.

Whenever you feel that the pull request is ready to be tested, either start all jenkins jobs pull requests by yourself, or simply add a comment in this pull request stating:

@jenkins-plone-org please run jobs

With this simple comment all the jobs will be started automatically.

Happy hacking!

[mauritsvanrees]

This needs help. Locally on my Mac, tox goes fine. But on GHA I get errors:

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____ ERROR collecting build/lib/icalendar/tests/hypothesis/test_fuzzing.py _____
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ImportError while importing test module '/home/runner/work/icalendar/icalendar/build/lib/icalendar/tests/hypothesis/test_fuzzing.py'.
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Hint: make sure your test modules/packages have valid Python names.
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Traceback:
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/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/importlib/__init__.py:127: in import_module
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    return _bootstrap._gcd_import(name[level:], package, level)
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build/lib/icalendar/tests/hypothesis/test_fuzzing.py:3: in <module>
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    from hypothesis import given, settings
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E   ModuleNotFoundError: No module named 'hypothesis'
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From looking at tox.ini, this file is only meant to be run on 2.7 and 3.6, where hypothesis is installed. I don't know why we would want to skip this test on other Python versions.
Locally, the test is probably not even found, so there are no complaints.

The rest of the errors is like this:

____________ ERROR collecting src/icalendar/tests/test_encoding.py _____________
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import file mismatch:
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imported module 'icalendar.tests.test_encoding' has this __file__ attribute:
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  /home/runner/work/icalendar/icalendar/build/lib/icalendar/tests/test_encoding.py
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which is not the same as the test file we want to collect:
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  /home/runner/work/icalendar/icalendar/src/icalendar/tests/test_encoding.py
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HINT: remove __pycache__ / .pyc files and/or use a unique basename for your test file modules

[mauritsvanrees]

Yes! All green, except the Jenkins tests that we can ignore. I have now disabled the web hooks for those. That might help for new PRs. If these checks still end up in new PRs, please ping me, then I need to have a deeper look.