scooter: compile only scooter (#424244)

pkgs/by-name/sc/scooter/package.nix

@@ -18,6 +18,12 @@ rustPlatform.buildRustPackage rec {
   useFetchCargoVendor = true;
   cargoHash = "sha256-kPweKXAitvODNoKTr2iB+qM9qMWGoKEQCxpkgrpnewY=";
 
+  # Ensure that only the `scooter` package is built (excluding `xtask`)
+  cargoBuildFlags = [
+    "--package"
+    "scooter"
+  ];
+
   # Many tests require filesystem writes which fail in Nix sandbox
   doCheck = false;