Add prepack hook to backend-core preserve correct version after bumped by lerna

packages/backend-core/package.json

@@ -13,6 +13,7 @@
   "license": "GPL-3.0",
   "scripts": {
     "prebuild": "rimraf dist/",
+    "prepack": "cp package.json dist",
     "build": "tsc -p tsconfig.build.json",
     "build:dev": "yarn prebuild && tsc --build --watch --preserveWatchOutput",
     "test": "jest",