Gleam: Cache Rust dependencies build step on GitHub actions

[lpil]

This is currently blocked by GitHub having not yet released their caching feature.

https://stackoverflow.com/questions/55110729/how-do-i-cache-steps-in-github-actions/57958803#57958803

[OvermindDL1]

A popular workaround I've seen so far is to save the cache as a 'Release' (either in same project or another) then just load that release via URL and populate as necessary.

[lpil]

Oh wow that's sneaky :)

[stefanluptak]

I can implement this if you can provide more info. I probably just need to know what to cache.

[lpil]

We want to cache the gleam/target directory I think. There might be some other directories we want to cache too, there's probably some best practices for caching Rust builds on the internet somewhere.

[stefanluptak]

OK, I'll check the best practices and try to implement it with the releases hack until the real caching is available.

[stefanluptak]

You can assign this to me too.

[stefanluptak]

There's a new preview version of a cache action here https://github.com/actions/cache
I tried it, but I exceeded the size limit of a cache (200MB), see https://github.com/EskiMag/gleam/runs/283487225#step:3:0
Are we able to somehow reduce the size to cache?

[stefanluptak]

The limit is already discussed here https://github.com/actions/cache/issues/6
Maybe it's enough to just wait until it's increased.

[lpil]

Good find! Let's wait for it to offer more storage because 200MB is not workable for us.