Updating to latest gRPC releases

[mcos]

First off, thanks for providing these dockerfiles, they're invaluable for development - especially as compiling from source is so time consuming.

Would it be possible to have these dockerfiles updated whenever the gRPC library releases a new version? The latest version of the library is v1.12.0, but the latest provided by this one is v1.10.0 for the Cxx library, and earlier still for the language-specific libraries.

I'd be happy to help out getting these up to date, but I'd love some guidance from maintainers first. Maybe there's an opportunity to automate the process, so the latest is always provided?

[markmandel]

Apologies for the delay. I have access to the docker hub controls, so if people want to do PRs to bring things up to date, I'm happy to facilitate the docker hub side of things.

I tend to make update PRs when I want/need updates personally - but happy to do the work to for other PRs as well.

(Expect a cxx update to 1.12.0 today)

[mehrdada]

@markmandel is this issue fully addressed? Shall we mark as closed?

[markmandel]

So the cpp example has been updated, but the rest of the languages haven't -- so I don't know if I would consider this "fully addressed"?

Would definitely still love PRs to bring the other languages up to date.