feat(packages): add librewolf for macOS

packages/librewolf/default.nix

@@ -0,0 +1,28 @@
+{ stdenv, fetchurl, lib, undmg }:
+
+stdenv.mkDerivation rec {
+  name = "librewolf";
+  version = "109.0-1";
+
+  url = "e0b46cbfb55504d33fd75b328ef3f5c7";
+  
+  src = fetchurl {
+    url = "https://gitlab.com/librewolf-community/browser/macos/uploads/${url}/librewolf-${version}.en-US.mac.aarch64.dmg";
+    sha256 = "5a60bc2b2d6fc6cbdfae8797178695b7139a0006869e5dbe214078a4d058f1f0";
+  };
+
+  buildInputs = [ undmg ];
+  sourceRoot = ".";
+  phases = [ "unpackPhase" "installPhase" ];
+  installPhase = ''
+    mkdir -p "$out/Applications"
+    cp -r Librewolf.app "$out/Applications/Librewolf.app"
+  '';
+
+  meta = with lib; {
+    description = "A custom version of Firefox, focused on privacy, security and freedom.";
+    homepage = "https://librewolf.net/";
+    maintainers = [ maintainers.nekowinston ];
+    platforms = platforms.darwin;
+  };
+}