Make this a set of Github actions

[Kixunil]

I want these things to be plug-and-play stuff that can just be GH actions so that I could use it in my own projects (but also I'd rather disassociate it from bitcoin).

It's mainly a suggestion for some student with love for devops and enough time. :) Not urgent/no pressure.

[apoelstra]

Interesting. I like this idea, though there are a lot of design questions for doing that -- for example, if we had a GA setup then we probably want to configure it via inline YAML rather than via shellscripts that live inside each crate. And it should still be possible for people to obtain the actual running code to run locally somehow.

[Kixunil]

if we had a GA setup then we probably want to configure it via inline YAML rather than via shellscripts

Exactly, that's the point

And it should still be possible for people to obtain the actual running code to run locally somehow.

One option is to write it in Rust and compile to WASM for GH actions written in NodeJS - this is theoretically platform-independent, the other option is to use composite GH action which just uses shell scripts but sadly, it's not platform-independent.

[Kixunil]

FTR I've briefly looked into composite actions and that looks pretty easy. Our scripts are already platform-dependent so it's not really an issue.