[NixOS] Add shutter for screenshotting

nixos/desktop.nix

@@ -80,6 +80,7 @@
     rofi
     rofi-pass
     rofi-systemd
+    shutter
     simplescreenrecorder
     skippy-xd
     synergy

nixos/home-manager.nix

@@ -119,6 +119,22 @@ inputs: { pkgs, config, ... }: {
     };
   };
 
+  systemd.user.services.shutter = {
+    Unit = {
+      Description = "Shutter";
+      After = [ "graphical-session-pre.target" "tray.target" ];
+      PartOf = [ "graphical-session.target" ];
+    };
+
+    Install = { WantedBy = [ "graphical-session.target" ]; };
+
+    Service = {
+      ExecStart = "${pkgs.shutter}/bin/shutter --min_at_startup";
+      Restart = "always";
+      RestartSec = 3;
+    };
+  };
+
   systemd.user.services.picom = {
     Unit = {
       Description = "Picom X11 compositor";