ci: consider building our own base image with protobuf installed

[tmc]

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[RobAWilkinson]

👍 for this this, searched out this package for hacktoberfest and I happen to have experience with grpc so I already had protbuf stuff installed.
From what I remember, the install of that toolchain isn't the easiest though and is a high barrier to entry.

I could bring that dependency into the docker file, sync the volume and have a dev env that people could hack in. Thoughts?

[tmc]

@RobAWilkinson I think having all of those things laid out to make for easier dev would be great.

The toolchain is unfortunately a little bit complicated and while I like the idea of providing instructions for common development environment having a docker based solution here makes a lot of sense to me! I'd be happy to collaborate on this.