[Feature] Add option to configure custom HMR port

[peterhirn]

Currently the HMR port is always random, see https://github.com/nksaraf/vinxi/blob/main/packages/vinxi/lib/dev-server.js#L52

For a working HMR setup in GitHub Codespaces we need to be able to configure a fixed port.

server: {
  hmr: {
    protocol: 'wss',
    port: 1234,
    clientPort: 443
  }
}

References

• Unable to set clientHost in HMR vitejs/vite#8666 (comment)
• https://vite.dev/config/server-options#server-hmr

[matt-potter]

Got he same issue here with a docker / local kubernetes development workflow - we aren't able to dynamically open ports.