[Bug]: html.template does not support public folder as expected

[Romej]

Version

System:
    OS: macOS 14.5
    CPU: (8) arm64 Apple M1
    Memory: 494.88 MB / 16.00 GB
    Shell: 5.9 - /bin/zsh
  Browsers:
    Brave Browser: 109.1.47.186
    Chrome: 126.0.6478.127
    Edge: 126.0.2592.87
    Safari: 17.5
  npmPackages:
    @rsbuild/core: 1.0.0-alpha.4 => 1.0.0-alpha.4 
    @rsbuild/plugin-node-polyfill: ^1.0.1 => 1.0.1 
    @rsbuild/plugin-react: 1.0.0-alpha.4 => 1.0.0-alpha.4 
    @rsbuild/plugin-svgr: ^1.0.0-alpha.4 => 1.0.0-alpha.4 
    @rsbuild/plugin-type-check: ^1.0.0-alpha.4 => 1.0.0-alpha.4

Details

Given the following config:

export default defineConfig({
  html: {
    template({ entryName }) {
      const templates = {
        foo: './public/index.html',
        bar: './public/bar.html',
      };
      return templates[entryName] || './public/index.html';
    },
  },
  source: {
    entry: {
      foo: './src/index.tsx',
      bar: './src/bar/index.tsx',
    },
  }
  ...

Then rsbuild will correctly display the http://localhost:3000/foo page.
But http://localhost:3000/bar will show a blank page.

It appears rsbuild is able to render a page in the public folder if the template file is called index.html
However, any other name such as bar.html will result in a blank page.

Does rsbuild support the public folder or is it necessary to migrate from public to static for it to work as expected ?

Reproduce link

https://github.com/Romej/rsbuild-public-entries

Reproduce Steps

1. install deps with yarn
2. run yarn dev
3. go to http://localhost:3000/foo (should render because template is called index.html)
4. go to http://localhost:3000/bar (should see blank page because template is called bar.html)