Fix missing .well-known files

Workaround `.well-known` files not being copied into the published container image by renaming the folder and manually mapping the requests.

Author: martincostello

src/Website/Program.cs

@@ -185,6 +185,19 @@ static string GetVersion<T>()
         => typeof(T).Assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>()!.InformationalVersion;
 });
 
+// HACK Workaround for https://github.com/dotnet/sdk/issues/40511
+app.MapGet(".well-known/{fileName}", (string fileName, IWebHostEnvironment environment) =>
+{
+    var file = environment.WebRootFileProvider.GetFileInfo(Path.Combine("well-known", fileName));
+
+    if (file.Exists && file.PhysicalPath is { Length: > 0 })
+    {
+        return Results.File(file.PhysicalPath, contentType: "application/json");
+    }
+
+    return Results.NotFound();
+});
+
 app.UseCookiePolicy(new()
 {
     HttpOnly = HttpOnlyPolicy.Always,