add build package command

.gitignore

 node_modules/
 .parcel-cache/
-dist/
\ No newline at end of file
+dist/
+/web-ext-artifacts/
\ No newline at end of file

package.json

@@ -10,6 +10,7 @@
   },
   "scripts": {
     "build-src": "parcel build src/manifest.json",
+    "build-package": "web-ext build -s dist/",
     "dev": "concurrently \"parcel src/manifest.json\" \"web-ext run -v -s dist/\" "
   },
   "devDependencies": {