fix: nix packaging

Author: es-sai-fi

.gitignore

@@ -3,3 +3,4 @@
 /*.gif
 /AGENTS.md
 /**/.DS_Store
+/result

package.nix

@@ -3,14 +3,20 @@
   rustPlatform,
 }:
 rustPlatform.buildRustPackage (finalAttrs: {
-  name = "gitv";
+  pname = "gitv";
+  version = "dev";
 
   src = ./.;
   cargoLock = {
     lockFile = ./Cargo.lock;
     allowBuiltinFetchGit = true;
   };
 
+  env = {
+    VERGEN_GIT_DESCRIBE = finalAttrs.version;
+    VERGEN_BUILD_DATE = "unknown";
+  };
+
   meta = {
     description = "Terminal-based viewer for GitHub issues";
     homepage = "https://github.com/JayanAXHF/gitv";