load appsettings.user.json as optional override

Program.cs

@@ -3,6 +3,8 @@ using Microsoft.Data.Sqlite;
 
 var builder = WebApplication.CreateBuilder(args);
 
+builder.Configuration.AddJsonFile("appsettings.user.json", optional: true, reloadOnChange: true);
+
 var dbPath = builder.Configuration["DbPath"]!;
 
 builder.Services.AddSingleton<Func<SqliteConnection>>(() =>