Test examples during CI

enabled an automatic merge when the pipeline for fdb67477 succeeds

aborted the automatic merge because source branch was updated

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• de411b4d - Also install cython for exmaples, because it's in requirements.txt

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• ff075bab - Install pyvisfile for examples CI

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• 4df8e4d5 - Install matplotlib for examples CI

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merged

mentioned in commit 618aa1a4