Migrated to the new web host builder and fixed a couple of issues.

src/Cofoundry.BasicTestSite/Program.cs

@@ -1,20 +1,18 @@
-namespace Cofoundry.BasicTestSite;
+var builder = WebApplication.CreateBuilder(args);
 
-public class Program
-{
-    public static void Main(string[] args)
-    {
-        CreateHostBuilder(args).Build().Run();
-    }
+builder.WebHost.UseLocalConfigFile();
+builder.Services
+    .AddControllersWithViews()
+    .AddCofoundry(builder.Configuration);
 
-    public static IHostBuilder CreateHostBuilder(string[] args) =>
-        Host.CreateDefaultBuilder(args)
-            .ConfigureWebHostDefaults(ConfigureWebHost);
+var app = builder.Build();
 
-    public static void ConfigureWebHost(IWebHostBuilder webBuilder)
-    {
-        webBuilder
-            .UseStartup<Startup>()
-            .UseLocalConfigFile();
-    }
+if (!app.Environment.IsDevelopment())
+{
+    app.UseExceptionHandler("/Error");
 }
+
+app.UseHttpsRedirection();
+app.UseCofoundry();
+
+app.Run();

src/Cofoundry.Web/App_Start/AddCofoundryStartupExtension.cs

@@ -1,8 +1,10 @@
 using Cofoundry.Core.DependencyInjection;
+using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.DependencyInjection.Extensions;
+using Microsoft.Extensions.Hosting;
 
 namespace Cofoundry.Web;
 
@@ -51,6 +53,9 @@ private static void AddAdditionalTypes(IMvcBuilder mvcBuilder)
         // Ensure IHttpContextAccessor is added, because it isn't by default
         // see https://github.com/aspnet/Hosting/issues/793
         mvcBuilder.Services.TryAddSingleton<IHttpContextAccessor, HttpContextAccessor>();
+
+        // In the new hosting model, IHostEnvironment is no longer registered with the service container
+        mvcBuilder.Services.TryAddTransient<IHostEnvironment>(s => s.GetRequiredService<IWebHostEnvironment>());
     }
 
     private static void DiscoverAdditionalApplicationParts(IMvcBuilder mvcBuilder, AddCofoundryStartupConfiguration cofoundryConfig)