feat(vite-plugin-nitro): add support for conditional server rendering at runtime

[brandonroberts]

PR Checklist

Closes #

What is the new behavior?

Current, you can fully opt-in or opt-out of SSR. This change allows you to specify certain routes that should only be rendered client side, and are not to be server rendered at runtime. This also allows you to render additional pages such as a 404.html page when deploying an SPA.

import { defineConfig } from 'vite';
import analog from '@analogjs/platform';

// https://vitejs.dev/config/
export default defineConfig(({ mode }) => ({
  // ...other config
  plugins: [
    analog({
      prerender: {
        routes: ['/', '/404.html'],
      },
      nitro: {
        routeRules: {
          // All admin URLs are only rendered on the client
          '/admin/**': { ssr: false },

          // Render a /404.html page as a fallback for SPAs
          '/404.html': { ssr: false },
        },
      },
    }),
  ],
}));

Does this PR introduce a breaking change?

• Yes
• No

Other information

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