Automate unit tests and kind tests in the CI

[lampajr]

Right now the CI is just trying to build the project but this might not be enough, I'd suggest to automate the testing the CI.

With this #26 we would add some bare minimal tests that we can run with either make test or make test-e2e, so automating the testing in the CI should be fairly easy and straightforward.

As part of this issue we could also improve the tests as well.

NOTE: I'd suggest to work on this after #26 merge