add dev-build script

package.json

@@ -8,6 +8,7 @@
   "license": "LicenseRef-LICENSE.md",
   "scripts": {
     "build": "webpack --mode production",
+    "dev-build": "webpack --mode development",
     "start": "webpack-dev-server --open --env.server=$BUBBLE_API",
     "dev": "webpack-dev-server --open --env.server=$MY_BUBBLE_API"
   },