Install protoc to avoid having to recompile it

[agourlay]

prost-build is the longest compiling dependency we have according to cargo --timings.

This is due to prost compiling protocolbuffers as well during the build tokio-rs/prost#610

Tokio recommends to install the protoc binaries to optimize the compilation process https://github.com/tokio-rs/prost#protoc=

This PR adds sudo apt install protobuf-compiler to our CI jobs.

I tested this locally and it does work nicely.

[agourlay]

Lots of errors I need to look into 😓

[e-ivkov]

Suggested change

	run: |
	.github/workflows/protoc.sh
	run: .github/workflows/protoc.sh

Same below

[agourlay]

Alright I finally got this to work 🥳

The original solution regarding installing protocolbuffers via apt did not work on github actions because ubuntu-latest means 20.04 which is using an old version of protoc.

The solution is to manually install the functioning version found in ubuntu 21.04 which is 3.12.4.

Regarding the docker container it is currently broken on master with:

  --- stderr
  thread 'main' panicked at '
  failed to execute command: No such file or directory (os error 2)
  is `cmake` not installed?

This is also a side effect of the tonic upgrade hyperium/tonic#965

As the docker container is not built very often I decided to simply install cmake in that case.

The bottom line is that every developer should install a recent protocolbuffers locally to avoid wasting time during cold compilation.

[agourlay]

Before

After