update simple-server example

examples/simple-server/vite.config.ts

@@ -0,0 +1,18 @@
+import { defineConfig } from "vite";
+import react from "@vitejs/plugin-react";
+import { viteSingleFile } from "vite-plugin-singlefile";
+import { resolve } from "path";
+
+// Get the entry from environment variable, default to ui-react
+const entry = process.env.VITE_ENTRY || "ui-react";
+
+export default defineConfig({
+  plugins: [react(), viteSingleFile()],
+  build: {
+    rollupOptions: {
+      input: resolve(__dirname, `${entry}.html`),
+    },
+    outDir: `dist`,
+    emptyOutDir: false,
+  },
+});