fix: add missing scripts to root package.json

Author: gregnr

package.json

@@ -2,5 +2,9 @@
   "private": true,
   "workspaces": [
     "packages/*"
-  ]
+  ],
+  "scripts": {
+    "build": "npm run build --workspaces",
+    "test": "npm run test --workspaces --if-present"
+  }
 }