Tweak/migirate from travis to gh actions

[dpanta94]

All Submissions:

• [x] Does your code follow the Extendables standards?
• [ ] Have you written new tests for your changes, as applicable?
• [x] Have you successfully run tests with your changes locally?

Changes proposed in this Pull Request:

Migrating from Travis to GH actions.

How to test the changes in this Pull Request:

1. During PRs the unit tests should be executed.

Other information:

• [x] Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changelog entry

No need for changelog entry

[kalessil]

@dpanta94 : approved, go ahead.