fix: move build:brownfield task to turbo repo root

Author: artus9033

packages/react-native-brownfield/turbo.json

@@ -12,6 +12,18 @@
     "test": {},
     "build": {
       "dependsOn": ["^build"]
+    },
+    "build:brownfield": {
+      "inputs": [
+        "packages/react-native-brownfield/package.json",
+        "packages/react-native-brownfield/android",
+        "packages/react-native-brownfield/!android/build",
+        "packages/react-native-brownfield/ios",
+        "packages/react-native-brownfield/!ios/build",
+        "packages/react-native-brownfield/!ios/Pods",
+        "packages/react-native-brownfield/src/"
+      ],
+      "outputs": ["lib/**"]
     }
   }
 }