CI: testing strategy

[ynfle]

I'm not really sure how to test this? The scope of this is image is to have a valid nim compiler. Should we just test that it can compile something and produces the correct output? Do we even need to test that?

@ErikSchierboom @ee7 any ideas?

[ErikSchierboom]

Should we just test that it can compile something and produces the correct output?

I think that would be a reasonable smoke test, yes.