Feature: ensure added/modified files have tests

[mrded]

Type of feature

🔁 CI

Current behavior

Contributes are allowed to propose changes without test files

Suggested solution

I think we should insist on having test files for every file changed or created

Additional context

No response

Code of Conduct

• [X] I agree to follow this project's Code of Conduct

Contributing Docs

• [X] I agree to follow this project's Contribution Docs

[mrded]

.take

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[mrded]

I made a GH Action to check existence of tests. Shall we try it on open-sauced repos?

https://github.com/mrded/gh-tests-existence-check

cc @0-vortex @bdougie