packages/backend,cli: revert publish config and remove postpack script requirement from image-build

packages/backend/package.json

@@ -1,18 +1,13 @@
 {
   "name": "example-backend",
   "version": "0.1.1-alpha.12",
-  "main": "src/index.ts",
+  "main": "dist/index.cjs.js",
   "types": "src/index.ts",
   "private": true,
   "license": "Apache-2.0",
   "engines": {
     "node": ">=12"
   },
-  "publishConfig": {
-    "access": "public",
-    "main": "dist/index.cjs.js",
-    "types": "dist/index.d.ts"
-  },
   "scripts": {
     "build": "backstage-cli backend:build",
     "build-image": "backstage-cli backend:build-image example-backend",
@@ -20,8 +15,6 @@
     "lint": "backstage-cli lint",
     "test": "backstage-cli test",
     "clean": "backstage-cli clean",
-    "prepack": "backstage-cli prepack",
-    "postpack": "backstage-cli postpack",
     "migrate:create": "knex migrate:make -x ts"
   },
   "dependencies": {