Support --offline builds #34
Description
Could be done one of two ways:
cargo vendorand a CI script to check if the dependencies match the lockfiles- Forks + submodules, then using CI to automatically pull new versions when needed
- Combination of the two.
Regardless of if we want to go the vendoring route or submodule route (I'm leaning toward the latter), this is still blocked on rust-lang/wg-cargo-std-aware#23.