Re: Nim based Github Actions

[jiro4989]

I created GitHub Actions too. And I published it.

[https://github.com/jiro4989/setup-nim-action](https://github.com/jiro4989/setup-nim-action)

[https://github.com/marketplace/actions/setup-nim-environment](https://github.com/marketplace/actions/setup-nim-environment)

But my actions is very simple (no caching). I will improve my actions with your 
cache stuff.

Thank your knowledge.