Fix potential github action smells

[ceddy4395]

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

• Avoid running CI related actions when no source code has changed
• Use 'if' for upload-artifact action
• Avoid uploading artifacts on forks
• Stop running workflows when there is a newer commit in PR

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

↪️ Pull Request

💻 Examples

🚨 Test instructions

✔️ PR Todo

• [ ] Added/updated unit tests for this change
• [ ] Filled out test instructions (In case there aren't any unit tests)
• [ ] Included links to related issues/PRs