feat(examples): add custom server example [skip-lint] (#9641)

Example using [Next.js Custom
Server](https://nextjs.org/docs/pages/building-your-application/configuring/custom-server)
with express.

Made from official
[examples/custom-server](https://github.com/vercel/next.js/tree/canary/examples/custom-server)
from Next.js repository.

Author: denolfe

examples/custom-server/.gitignore

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examples/custom-server/README.md

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+# Payload 3 with Custom Server
+
+Uses a [Next.js Custom Server](https://nextjs.org/docs/pages/building-your-application/configuring/custom-server) with express.
+
+Made from official [examples/custom-server](https://github.com/vercel/next.js/tree/canary/examples/custom-server) from Next.js repository.

examples/custom-server/next-env.d.ts

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+/// <reference types="next" />
+/// <reference types="next/image-types/global" />
+
+// NOTE: This file should not be edited
+// see https://nextjs.org/docs/app/building-your-application/configuring/typescript for more information.

examples/custom-server/next.config.ts

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+import { withPayload } from "@payloadcms/next/withPayload";
+import type { NextConfig } from 'next'
+
+const nextConfig: NextConfig = {}
+
+export default withPayload(nextConfig)

examples/custom-server/nodemon.json

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+{
+  "watch": ["src/server.ts"],
+  "exec": "tsx src/server.ts",
+  "ext": "ts"
+}