Add CI Instructions for Github Actions

[EduardoSimon]

Motivation for the change

I have started to test my dot files repository and found ZUnit to be the perfect candidate for that daunting task. I love the documentation and the philosophy behind it. I had trouble setting in up in my CI system of choice: Github Actions. You can find how I did it on my dot files repo: https://github.com/EduardoSimon/dotfiles/blob/main/.github/workflows/testCI.yml I found interesting to share my findings.

[EduardoSimon]

Hi @molovo , should I close this PR?

[vladdoster]

@EduardoSimon,

You can find another example of github actions + zunit in the Zinit project.

Link to the Zunit code