Nix Packaging tracking issue

[nixith]

Following the discussions in #212 I felt it would be best to set up a tracking issue for nix things. Currently on the list:

• 1. Figure out what's going on with crane and why their full workspace config works
  • [ ] upstream changes from the workspace quick start config pending on #215
• 2. work out issues in build system blocking nix
  • [ ] build.rs tries to build outside of OUT_DIR, which nix doesn't like
  • [ ] work out how rust config might happen if rustc needs to be available at runtime
    • [ ] git reference to pinnacle-api-defs works with cargo build but not in nix
      • package doesn't get to see the full source with api/protocol/ like in cargo build
      • api/protocol only seems referenced here an in xtask - maybe move it here?
      • alternative is retrieve it with cargo-make or something similar
  • [ ] figure out the luarocks situation (either roll it as part of 3 or use something like luarocks-nix during build)
• 3. (maybe) nix configuration
  • [ ] direct nix config (probably don't do this)
  • [ ] make lua config from options
  • [ ] however declarative nix -> rust -> compiled config would work