Workspace with Multiple interdependent crates

[cetra3]

We have a workspace that has a few crates we use as libraries. I.e, a layout like so:

• library1/lib.rs
• library2/lib.rs <-- depends on library1
• binary/main.rs <-- depends on library1 & library2

With cargo chef cook & prepare, both the libraries and binary are all skeleton files, so we can never cache library1 & library2, they are built each time.

One possible solution is to layer it, so we run cargo chef cook a couple of times to build up the cache layers. However, we'd need an option to ensure that cargo chef does not create/overwrite skeleton files for certain crates within the workspace.

I.e, you could imagine:

• prepare
• copy over the recipe.json
• copy over just library1
• cook, but exclude skeletons for library1
• copy over library2
• cook, but exclude skeletons for library1 & library2
• full build