Using appsettings.json for different environments

[suchja]

Most likely this is not a specific question about statiq, but I searched for hours without any success.

I would like to have settings like Host and LinkRoot only specified for the production environment (e.g. GitHub Pages). When running statiq's preview server, it should just work out of the box on localhost without any specific LinkRoot.
So I created this appsettings.json:

{
    "Host": "",
    "LinkRoot": "",
    "LinksUseHttps": false
}

as well as an appsettings.Production.json

{
    "Host": "suchja.github.io/",
    "LinkRoot": "/statiq-dopetrope-demo",
    "LinksUseHttps": true
}

Additionally I do have a settings.yml with some generic definitions (that I couldn't get into the appsettings.json - especially the calculated PageTitle):

SiteTitle: Dopetrope (Statiq)
PageTitle: |
  =>
  {
    string siteTitle = Context.GetString("SiteTitle");
    string title = GetString("Title");
    return string.IsNullOrWhiteSpace(siteTitle) ? title : (string.IsNullOrWhiteSpace(title) ? siteTitle : $"{siteTitle} - {title}");
  }
Copyright: => "No Copyright"
PostSources: posts/**/*
IsPost: => Context.Outputs.FilterSources(Context.GetString("PostSources")).ContainsById(Document)
PageSources: pages/**/*
IsPage: => Context.Outputs.FilterSources(Context.GetString("PageSources")).ContainsById(Document)
Layout: /_layout.cshtml

However, when I run dotnet run --environment Production the content from appsettings.Production.json seems not to be used, because the links in index.html do not change.

[AlexHedley]

I've been meaning to ask the same q.

I'd tried dotnet run --environment Development -- preview for the same reason since I need different settings when running locally compared to the deployed one.