Extending CI

[est31]

It would be cool to extend CI a little bit and to:

• a) Performing a full cargo test (those also perform linking of the native client)

• b) Running inference on a few test samples to ensure everything is alright

For a) we'd need to have either builds of the native client or do those builds ourselves (see #3), while for b) we'd need to have pregenerated models.

[est31]

a) has been implemented by commits 26e0eac d4aeaa0 f2d4bc6