Get npm run dev to work again

Signed-off-by: Sebastian Malton <sebastian@malton.name>

packages/generate-tray-icons/package.json

@@ -6,7 +6,9 @@
   "scripts": {
     "clean": "rimraf dist/",
     "build": "swc ./src/index.ts -d ./dist/",
-    "prepare:dev": "npm run build",
+    "postbuild": "run-script-os",
+    "postbuild:nix": "chmod u+x ./dist/index.js",
+    "dev": "npm run build",
     "prepare": "npm run build"
   },
   "bin": {
@@ -27,7 +29,8 @@
     "@types/jsdom": "^20.0.1",
     "@types/node": "^18.11.18",
     "@types/sharp": "^0.31.1",
-    "rimraf": "^4.1.2"
+    "rimraf": "^4.1.2",
+    "run-script-os": "^1.1.6"
   },
   "dependencies": {
     "arg": "^5.0.2",