fix: public dir path error

Author: sanyuan0704

src/node/plugin-island/config.ts

@@ -118,8 +118,11 @@ export function pluginConfig(
     configureServer(server) {
       return async () => {
         // Serve public dir
-        if (await fs.pathExists(PUBLIC_DIR)) {
-          server.middlewares.use(sirv(path.join(config.root, PUBLIC_DIR)));
+        // Cause by the pre-bundle problem, we have to set the island package as the root dir
+        // So we need to serve the public dir in user's root dir manually
+        const publicDir = path.join(config.root, PUBLIC_DIR);
+        if (await fs.pathExists(publicDir)) {
+          server.middlewares.use(sirv(publicDir));
         }
       };
     }