Build some CI jobs with buildstream remote execution

Background

Seems the remote execution code is not being tested anywhere, this would be a way to at least check things doesn't break

Task description

The idea would be to execute some of our test / exemples but using remote execution

It needs to be exactly the same test /example, so in case of failure we can compare the local build and the one using remote execution

Acceptance Criteria

• Some CI jobs, apart from being build locally, are being build using buildstream remote execution,