chore(rsc): fix useBuildAppHook: true with cloudflare plugin (#780)

Author: hi-ogawa

packages/plugin-rsc/examples/starter-cf-single/vite.config.ts

@@ -17,6 +17,7 @@ export default defineConfig({
       },
       serverHandler: false,
       loadModuleDevProxy: true,
+      useBuildAppHook: true,
     }),
     cloudflare({
       configPath: './wrangler.jsonc',
@@ -49,4 +50,9 @@ export default defineConfig({
       },
     },
   },
+  builder: {
+    // empty buildApp to disable cloudflare's buildApp
+    // https://github.com/cloudflare/workers-sdk/blob/19e2aab1d68594c7289d0aa16474544919fd5b9b/packages/vite-plugin-cloudflare/src/index.ts#L183-L186
+    buildApp: async () => {},
+  },
 })