replacing travis with github workflow
Created by: scarrazza
This PR addresses the issue #676 (closed) by replacing travis builds with github workflows. I have checked and our account does not have time/build limitations. This implementation replaces all travis builds, and its much faster, approx 15min per build.
The linux implementation is based on github ubuntu installation, which already comes with conda.
The macos implementation is similar to travis, I didn't manage to use the conda installation and SDK already shipped in the image. If someone wants to play is welcome.