controller: Add icon

controller/default.nix

@@ -15,11 +15,17 @@
         };
       };
 
-      packages = with pkgs; [ ];
+      packages = with pkgs; [
+        imagemagick
+      ];
 
       env = { };
 
-      scripts = { };
+      scripts = {
+        gen-icon.exec = ''
+          magick icon.png -resize 128x128 -define icon:auto-resize="128,96,64,48,32,16" icon.ico
+        '';
+      };
     };
   };
 }