Migrate from Travis to GitHub Actions; actions implementation needs to be kept in sync with NodeJS releases ...

[awaterma]

We need to keep our Travis testing in sycn with NodeJS releases: https://nodejs.org/en/about/releases/

[awaterma]

We want to also add another integration testing framework that won't limit our use, but we think we want to retain Travis.

[awaterma]

Looking at: https://github.com/actions/setup-node, for this work.