package.json: build-Script (expo export web) fuer Preview-Deploy

package.json

@@ -31,7 +31,8 @@
     "android": "expo start --android",
     "ios": "expo start --ios",
     "web": "expo start --web",
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsc --noEmit",
+    "build": "expo export --platform web"
   },
   "private": true
 }