build: added cache build folder for docs app

turbo.json

@@ -3,7 +3,7 @@
   "pipeline": {
     "build": {
       "dependsOn": ["^build"],
-      "outputs": ["dist/**", ".next/**", "!.next/cache/**", "dist-cjs/**", "dist-es/**", "dist-types/**"]
+      "outputs": ["dist/**", ".next/**", "!.next/cache/**", "dist-cjs/**", "dist-es/**", "dist-types/**", "build/**"]
     },
     "generate": {
       "outputs": []