40774e8c

By: Lucien Huber <im@lcnbr.ch>

simplify Rust workspace build definitions

Reuse upstream Crane buildDepsOnly with artifact inheritance, share dependency
components with CI scheduling, consolidate workspace checks, and remove unused
helpers and redundant artifact-builder settings.

All 413 public derivation/output pairs remain identical across the three
supported platforms. The cached graph/configuration check passes locally.

User request:
also does the nix/rust-workspace.nix need to be so huge? KISS