fix: viewer project should build output before publish

Author: dannyrb

platform/viewer/package.json

@@ -28,7 +28,8 @@
     "start": "yarn run dev",
     "test:e2e": "cypress open",
     "test:unit": "jest --watchAll",
-    "test:unit:ci": "jest --ci --runInBand --collectCoverage"
+    "test:unit:ci": "jest --ci --runInBand --collectCoverage",
+    "prepublishOnly": "yarn run build:package"
   },
   "files": [
     "dist",