Minor fix for build stage

frontend/package.json

@@ -5,7 +5,7 @@
     "ng": "ng",
     "init-env": "ts-node --skip-project ./scripts/set-env.ts",
     "start": "npm run init-env -- --environment=dev && ng serve --port 80",
-    "build": "ng build",
+    "build": "npm run init-env -- --environment=prod && ng build --output-path ./dist",
     "test": "ng test",
     "lint": "ng lint",
     "e2e": "ng e2e"