fix: nix packaging

[es-sai-fi]

Solves #146.

[greptile-apps]

Greptile Summary

This PR fixes Nix packaging by splitting the legacy name attribute into separate pname and version fields (as required by modern buildRustPackage), removing allowBuiltinFetchGit (safe since Cargo.lock has no git-sourced dependencies), and injecting VERGEN_GIT_DESCRIBE / VERGEN_BUILD_DATE env vars so the binary reports a consistent version string at build time. It also adds /result to .gitignore to stop the Nix build symlink from being tracked.

• package.nix: name → pname + version, cargoLock simplified, env block added for VERGEN variables.
• .gitignore: /result added to suppress the nix build output symlink from being committed.

Important Files Changed

Filename	Overview
package.nix	Fixes Nix packaging: splits name into pname+version, removes allowBuiltinFetchGit (safe — no git-sourced deps in Cargo.lock), and injects VERGEN env vars so the binary reports consistent version info at build time.
.gitignore	Adds /result to ignore the Nix build symlink, addressing the issue raised in the previous review thread.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["nix build"] --> B["rustPlatform.buildRustPackage"]
    B --> C["Fetch src = ./."]
    C --> D["Resolve cargoLock.lockFile = ./Cargo.lock"]
    D --> E["Set env vars\nVERGEN_GIT_DESCRIBE=dev\nVERGEN_BUILD_DATE=unknown"]
    E --> F["cargo build --release"]
    F --> G["/nix/store/...-gitv-dev\n  bin/gitv"]
    G --> H["result symlink\n(ignored by .gitignore)"]

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_{Reviews (5): Last reviewed commit: "fix: nix packaging" | Re-trigger Greptile}

[es-sai-fi]

I removed cargoLock.allowBuiltinFetchGit from the package because it is not needed for gitv :P