build(xatu): limit package source closure

src/xatu/package.nix

@@ -12,14 +12,18 @@ pkgs.rustPlatform.buildRustPackage {
     fileset = lib.fileset.unions [
       (root + "/Cargo.lock")
       (root + "/Cargo.toml")
-      (root + "/src/ariadne")
-      (root + "/src/machoke")
       (root + "/src/monorepo")
       (root + "/src/status")
       (root + "/src/xatu")
     ];
   };
 
+  postPatch = ''
+    substituteInPlace Cargo.toml \
+      --replace-fail '    "src/ariadne",' "" \
+      --replace-fail '    "src/machoke",' ""
+  '';
+
   cargoBuildFlags = [
     "-p"
     "xatu"