Web root is incorrect when using new minimal hosting API (WebApplication.CreateBuilder)

[DamianEdwards]

When using the new minimal hosting API (e.g. WebApplication.CreateBuilder) the web root folder is incorrectly set resulting in static files not working.

Issue seems to be here somewhere as it looks like it's trying to combine a path that's already been combined in the constructor:

aspnetcore/src/DefaultBuilder/src/WebHostEnvironment.cs

Line 68 in c9fa4e1

WebRootFileProvider = new PhysicalFileProvider(Path.Combine(ContentRootPath, WebRootPath));

@halter73 @davidfowl

Found in version 6.0.100-preview.5.21254.10

[DamianEdwards]

Workaround:

var builder = WebApplication.CreateBuilder(args);

// BUG: Workaround for https://github.com/dotnet/aspnetcore/issues/32415
builder.Environment.WebRootPath = System.IO.Path.Combine(builder.Environment.ContentRootPath, "wwwroot");
var fixedWebRootFileProvider = new PhysicalFileProvider(builder.Environment.WebRootPath);
switch (builder.Environment.WebRootFileProvider)
{
    case PhysicalFileProvider _:
        builder.Environment.WebRootFileProvider = fixedWebRootFileProvider;
        break;
    case CompositeFileProvider cfp when cfp.FileProviders is IFileProvider[] providers:
        providers[0] = fixedWebRootFileProvider;
        break;
}

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