chore(rust): more reusable musl build params

[dzmitry-lahoda]

No description provided.

[Copilot]

Pull Request Overview

This PR refactors the Nix build script to make MUSL build parameters more configurable and reusable. It introduces new parameters to support different build targets and hermetic builds.

Key changes:

• Made the build target configurable via a target parameter (defaulting to x86_64-unknown-linux-musl)
• Added support for hermetic builds through an optional self parameter containing git revision info
• Conditional logic for git dirty tree checks and ulimit based on whether hermetic builds are enabled

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[dzmitry-lahoda]

I guess can reuse same zig builder env in flake pkg and in non hermetic builds, because you used zig, can hid all complexity behind this thing

[cherryman]

imo we shouldn't have this in this repo in the first place. if we do anything, it should be an extension to crane that supports building using cargo-zigbuild as we've already somewhat solved. what remains is making minor patches to the upstream project so that it's more compatible with nix

[dzmitry-lahoda]

you mean we should not mix zigbuild in hermetic and non hermetic builds?

crane does only hermetics builds, it does not adops possible strategy to allow for both as needed.

[cherryman]

you mean we should not mix zigbuild in hermetic and non hermetic builds?

yeah exactly. it's a bit misleading imo to have a command that says "this will do cross-compilation" but is non-hermetic. it's sort of a hack to begin with. i'd take it out of the repo. we've already worked out a way of having (semi-workable) cross-compilation