write logs for inference and loader to file

Azaion.LoaderUI/App.xaml.cs

@@ -2,7 +2,6 @@
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
-using Microsoft.Extensions.Options;
 using Serilog;
 
 namespace Azaion.LoaderUI;
@@ -29,7 +28,7 @@ public partial class App
         var host = Host.CreateDefaultBuilder()
             .ConfigureAppConfiguration((_, config) => config
                 .AddCommandLine(Environment.GetCommandLineArgs())
-                .AddJsonFile(Constants.CONFIG_JSON_FILE))
+                .AddJsonFile(Constants.CONFIG_JSON_FILE, optional: true))
             .UseSerilog()
             .ConfigureServices((context, services) =>
             {