Migrate from TravisCI to Github Actions

[lwouis]

Is your feature suggestion related to a problem? Please describe.
Currently CI/CD is done on TravisCI. They sponsor OSS with 500 minutes/month of build on a mac. I just checked out Github Actions pricing and their free tier have 2000 minutes/month.

Also TravisCI has me open a ticket to ask for credits every time I run out. It's not fun, and it takes them weeks sometimes to re-credit the project, which freezes any release we would have ready to ship.

For these reasons, it may be worth the effort to move to Github Actions.

We could also look at other providers like Azure Pipelines, which I've used successfully in the past as well.

Describe the solution you'd like
Not having to worry about build minutes.

Describe alternatives you've considered
We can stay on TravisCI. It works well and was hard/long to setup.

[lwouis]

Github Actions actually has a 10x minutes multiplier for macOS machines. This means that we would only get 200min/month with them.

[lwouis]

Migrated today 🎉