minor fixes for nextjs

examples/nextjs/src/app/api/[[...bknd]]/route.ts

@@ -1,5 +1,9 @@
 import { getApp } from "@/bknd";
 
+// if you're not using a local media adapter, or file database,
+// you can uncomment this line to enable running bknd on edge
+// export const runtime = "edge";
+
 const handler = async (request: Request) => {
    const app = await getApp();
    return app.fetch(request);

examples/nextjs/src/app/env/route.ts

@@ -0,0 +1,3 @@
+export const GET = async (req: Request) => {
+   return Response.json(process.env);
+};

examples/nextjs/src/bknd.ts

@@ -2,12 +2,20 @@ import { type NextjsBkndConfig, getApp as getBkndApp } from "bknd/adapter/nextjs
 import { registerLocalMediaAdapter } from "bknd/adapter/node";
 import { headers } from "next/headers";
 
+// The local media adapter works well in development, and server based
+// deployments. However, on vercel or any other serverless deployments,
+// you shouldn't use a filesystem based media adapter.
+//
+// Additionally, if you run the bknd api on the "edge" runtime,
+// this would not work as well.
+//
+// For production, it is recommended to uncomment the line below.
 registerLocalMediaAdapter();
 
 export const config = {
    connection: {
-      // make sure to use a remote URL for production!
-      url: "file:data.db",
+      url: process.env.DB_URL as string,
+      authToken: process.env.DB_TOKEN as string,
    },
 } as const satisfies NextjsBkndConfig;