Thanks, I really loved the idea. I went ahead and implemented a reusable GitHub Action reusing most of the ideas brought by this article. You can have a look here: https://github.com/SamuelCabralCruz/free-code-coverage.

Be indulgent, it still is only a simple Proof-of-Concept and code quality is not at its best, but I first wanted to release a working version before investing to much time and energy for something nobody else than me would use. Let me know what you think of it!