Move to setting version info explicitly in linker flags

We don't have go built-in VCS information in a nix build because the git
repository isn't present. After struggling to build an overlay that
would provide it, I decided this path is easier of just injecting in the
data that we need.

Issue: #5

default.nix

@@ -1,4 +1,4 @@
-{ pkgs ? import <nixpkgs> { }, proj ? pkgs.proj }:
+{ ldflags, version, pkgs ? import <nixpkgs> { }, proj ? pkgs.proj }:
 
 let
   # Get commit timestamp at eval time (pure)
@@ -12,24 +12,12 @@ let
     else "0";
 in
 pkgs.buildGoModule rec {
+  inherit ldflags version;
   pname = "nidus-sync";
-  version = "0.0.12";
   src = ./.;
   
-  gitRevision = 
-    if builtins.pathExists ./.git 
-    then pkgs.lib.commitIdFromGitRepo ./.git 
-    else "unknown";
-  
   buildTime = getCommitTime;
   
-  ldflags = [
-    "-s"
-    "-w"
-    "-X main.Version=${version}"
-    "-X main.Commit=${gitRevision}"
-    "-X main.BuildTime=${buildTime}"
-  ];
   meta = {
     description = "Nidus Sync";
     homepage = "https://github.com/Gleipnir-Technology/nidus-sync";
@@ -74,4 +62,5 @@ pkgs.buildGoModule rec {
     cp -r vite/rmo/static/gen/rmo $out/share/frontend/
     cp -r vite/rmo/static/gen/sync $out/share/frontend/
   '';
+
 }