Vite HMR config does not override Ladle default config

[gapark]

Describe the bug

When trying to use vite.config.mjs to override the default HMR settings (server.hmr) the settings in vite.config.mjs are never applied.

Reproduction

I'm trying to run ladle within a docker container. The problem I am having is that the WS connection to my docker container fails and to fix this I need to override the HMR host. Essentially:

• Since version 17, nodejs favours IPV6.
• When using localhost as the HMR host (forced by ladle) starts server on IPV6.
• I am currently unable to use IPV6 with my docker setup.

To reproduce this issue simply attempt to change server.hmr.host or server.hmr.port in your .ladle/vite.config.mjs and it will not be applied.

I think I have found the issue within the codebase:

• Here a hardcoded default HMR config can be found.
• This hardcoded config gets merged into the user config here and overwrites any user HMR settings. This issue says that these settings should work so I am assuming something has accidentally broken this section of the config since then.

Potential Fix

I'm not 100% certain, but from a quick glance I think a fix would be adding HMR settings to the ladle config, and then merging them in here as we do with the other settings in the ladle config.

[gapark]

This PR is not ready to be merged, I don't have time to get the project set up locally right now to test things fully, but this should be a good example of a fix for the problem: https://github.com/tajo/ladle/pull/558

[gapark]

@tajo any chance you could help me get a fix together and merged for this? I've already attempted a PR here #558, any suggestions or assistance would be greatly appreciated. 🙇🏻