Create a wheel cache

[tdejager]

So, it would be nice to have cache of built wheel files, once we built them using #32 this way we can re-use them over solves or platforms when using with pixi.

So @baszalmstra and I discussed using cacache-rs for this.

[cnpryer]

Would this also support #64?

[tdejager]

@cnpryer Sure! Although the downloaded artifacts are already cached :) We could also start using cacache-rs for that thats what you mean?

[cnpryer]

We could also start using cacache-rs for that thats what you mean?

Yea I was thinking through the ways it could be implemented.

[baszalmstra]

@tdejager Do we want to store the unpacked wheel in the cache? (Through an indirection).

So we have an entry: rip::wheel::<integrity> that contains metadata that describes the files in the .whl and their integrities. Then we can use the same thing for regular wheels as well.

[tdejager]

So the plan for now is:

• Create a disk cache using cacache.
• Store metadata for the hashed sdist.
• Store the wheel by hash and store the hash in the metadata for the sdist.

After which we should add functionality to:

• Check if we have already built the wheel when building an sdist.
• Install wheels from cache and package_db

[tdejager]

Implemented in #107 and #111