Fix potential github action smells

[ceddy4395]

Hey! 🙂 I want to contribute the following changes to your workflow:

• Avoid starting new workflow whilst the previous one is still running
• Run tests on multiple OS's
• Stop running workflows when there is a newer commit in branch
• Avoid uploading artifacts on forks

(These changes are part of a research Study at TU Delft looking at GitHub Action Smells. Find out more)

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