如果配置是` `trailingSlash: true`，如何为Next.js + GitHub页面创建自定义404页面

import React from 'react';

const Custom404 = () => {
  return (
    <div>
      <h1>404 - Page Not Found</h1>
      <p>The page you are looking for does not exist.</p>
    </div>
  );
};

export default Custom404;

import React from 'react';
import { useRouter } from 'next/router';
import Custom404 from './404';

const ErrorPage = () => {
  const router = useRouter();

  // 如果页面不存在，返回自定义404页面
  if (router.asPath === '/404') {
    return <Custom404 />;
  }

  return (
    <div>
      <h1>500 - Server-side error occurred</h1>
      <p>An error occurred while rendering the page.</p>
    </div>
  );
};

export default ErrorPage;

next build && next export && mv out/404/index.html out/404.html