Issues with shared Github Actions workflows

[xunleii]

Hi @zgosalvez

Firstly, thanks a lot for this Action, I use it every day.

I'm currently sharing my day-to-day workflows on a this repository and your Action currently fails with the new syntax (see https://docs.github.com/en/actions/learn-github-actions/reusing-workflows#calling-a-reusable-workflow) (if you need more information, here is the failed job).
Furthermore, I think we can ensure that theses shared workflow should be pinned like other uses fields.

[zgosalvez]

Finally, GitHub allows for reusing workflows. This is very new, and I'll need time to learn the changes and review the code to support the new syntax. Hopefully, we can have version 2 released soon, but any PR is welcome!

[xunleii]

@zgosalvez I made a PR to add compatibility with this new Github feature