Ghext: independent git HEAD extractor

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Ghext is a small library that pulls HEAD hashes from git repositories. Deploy it as a regular library or use it within build.zig.

libgit2 or its bindings would be a heavy dependency. This library is light and capable of delivering even without git installed (MO builds, very edgy cases, etc.).

I wanted to see if I could drop heap allocations before the upcoming release, but after figuring out the build system usage, it became less relevant, so probably later.

build.zig:

const build_options = b.addOptions();

exe.root_module.addOptions("build_options", build_options);
build_options.addOption([]const u8, "head_hash", try hash());

inline fn hash() ![]const u8 {
    const gxt = @import("ghext").Ghext.read(std.heap.page_allocator) catch unreachable;
    return gxt.hash;
}

app.zig:

const build_options = @import("build_options");
const hash = build_options.head_hash[0..7];

Any feedback is appreciated!
Cheers!!