fix: fixed publish dates for builds

nix/package.nix

@@ -5,26 +5,49 @@
   pnpm_10,
   fetchPnpmDeps,
   pnpmConfigHook,
+  git,
   siteUrl,
+  sourcePath ? ./..
 }: let
   nodejs = nodejs_latest;
   pnpm = pnpm_10;
+  
+  # Filter source: use cleanSourceFilter as base, but include .git and exclude _site
+  filteredSrc = lib.cleanSourceWith {
+    src = sourcePath;
+    filter = path: type:
+      let
+        baseName = baseNameOf path;
+        # Always include .git directory
+        isGit = baseName == ".git" || lib.hasInfix "/.git/" path || lib.hasSuffix "/.git" path;
+      in
+        isGit || (
+          # Apply base cleanSourceFilter
+          lib.cleanSourceFilter path type &&
+          # Additional exclusions
+          baseName != "_site" &&
+          baseName != "node_modules"
+        );
+  };
 in
   stdenv.mkDerivation (finalAttrs: {
     pname = "volpe";
     version = "1.0.0";
 
-    src = lib.cleanSource ./..;
+    src = filteredSrc;
 
     nativeBuildInputs = [
       nodejs
       pnpm
       pnpmConfigHook
+      git
     ];
 
     # fetchPnpmDeps creates the offline store
+    # Use clean source (excludes .git, _site, node_modules)
     pnpmDeps = fetchPnpmDeps {
-      inherit (finalAttrs) pname version src;
+      inherit (finalAttrs) pname version;
+      src = lib.cleanSource sourcePath;
       hash = "sha256-rN8P6g/Wuug+fv0rm/qbKN01NgcbpgEQmhDFe2X42uA=";
       fetcherVersion = 3; # pnpm store version
     };
@@ -45,4 +68,4 @@ in
 
       runHook postInstall
     '';
-  })
+  })