Add test for latest tonic

[clux]

Given sudden protobuf inclusion from there, and it being such a popular dependency, we should have a test here for it to catch changes more easily.

#105 (comment) suggests we might need protobuf-dev now.

[Zizico2]

#105 (comment) author here.

tonic works fine. The problem is tonic-types.

[clux]

Either way, would like to be made aware of things breaking at the CI level before everyone else notices the image does't work :-)

I have added libprotobuf-dev speculatively as it's what tonic requires, please lemme know if it doesn't work (after the next build)!

Leaving the issue open because I still want to have a test crate here here that uses tonic in a basic way (like we do for other popular crates).

[Zizico2]

Yep, it's building now