yubikey-touch-detector: add missing systemd units and docs

pkgs/tools/security/yubikey-touch-detector/default.nix

@@ -16,6 +16,15 @@ buildGoModule rec {
 
   buildInputs = [ libnotify ];
 
+  postInstall = ''
+    install -Dm444 -t $out/share/doc/${pname} *.md
+
+    install -Dm444 -t $out/lib/systemd/user *.{service,socket}
+
+    substituteInPlace $out/lib/systemd/user/*.service \
+      --replace /usr/bin/yubikey-touch-detector "$out/bin/yubikey-touch-detector --libnotify"
+  '';
+
   meta = with lib; {
     description = "A tool to detect when your YubiKey is waiting for a touch (to send notification or display a visual indicator on the screen).";
     homepage = "https://github.com/maximbaz/yubikey-touch-detector";