feature request: add protoc into the image

[Sherlock-Holo]

tonic-build require the protoc cli tool to generate codes, this image doesn't contain this tool

[clux]

I think that's reasonable request as it's a very common dependency.

Will put this as help-wanted for now. Will need compile instructions from src in the Dockerfile and ideally a quick test crate.

[Sherlock-Holo]

I create a PR to add protoc #106
@clux

[Zizico2]

Is Tonic still working? I seem to need protobuf-dev.
I'm getting: google/protobuf/any.proto: File not found