Adding a mount causes the home directory to have group=root

### Description

I'm using Lima on macOS, with the `vz` driver and a Debian 13 image. I noticed that if I add a mount like this one:

```
- {location: "/some/local/path", mountPoint: "{{.Home}}/foobar",}
```

the owner of the home directory in the VM changes from `myuser:myuser` to `myuser:root`.

This is not a big issue, but it can lead to some [interesting side effects](https://phabricator.wikimedia.org/T414824), so it would be nice if Lima behaved more consistently.