Root "/" doesn't get prerendered with Github Pages preset

[sby1ce]

Environment

nitro 2.9.5

Reproduction

In nitro.config.ts

export default defineNitroConfig({
  srcDir: "server",
  preset: "github-pages"
});

https://codesandbox.io/p/github/unjs/nitro/csb-rqd4sc/draft/old-sky?file=%2Fnitro.config.ts%3A6%2C1

Describe the bug

nitro build with "github-pages" preset doesn't prerender index.html file like with the "static" preset which doesn't seem to be intended behaviour.
this is due to github pages preset adding 404.html route in prerender object

nitro/src/presets/github-pages.ts

Lines 10 to 15 in eb377ab

	prerender: {
	routes: [
	// https://docs.github.com/en/pages/getting-started-with-github-pages/creating-a-custom-404-page-for-your-github-pages-site
	"/404.html",
	],
	},

this check is no longer true

nitro/src/prerender.ts

Lines 40 to 43 in 2bce7ad

	// Crawl / at least if no routes are defined
	if (nitro.options.prerender.crawlLinks && routes.size === 0) {
	routes.add("/");
	}

so index.html doesn't get prerendered

Additional context

manually adding "/" to routes array should fix this but maybe there's a better solution

Logs

No response

[pi0]

please share a runnable reproduction

[sby1ce]

here you are
https://codesandbox.io/p/github/unjs/nitro/csb-rqd4sc/draft/old-sky?file=%2Fnitro.config.ts%3A6%2C1

[pi0]

Thanks for repro. Feel free to make a PR for adding / by default for github-pages 👍🏼