C# Application startup builder

appsettings.json

{
  "Logging": {
    "LogLevel": {
      "Default": "Debug",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "Serilog": {
    "PathFormat": "Logs/log-{Date}.txt",
    "LogLevel": {
      "Default": "Debug",
      "Microsoft": "Information"
    }
  }
}

ServiceBuilder.cs

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

namespace Main;

/// <summary>
/// Service builder class.
/// </summary>
public static class ServiceBuilder
{
    
    /// <summary>
    /// Builds the application services, including configuration and logging.
    /// </summary>
    /// <returns>Service provider with system services</returns>
    public static ServiceProvider BuildServices()
    {
        // Build configuration
        var configurationBuilder = new ConfigurationBuilder()
            .SetBasePath(Path.Combine(AppContext.BaseDirectory))
            .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);
        var configuration = configurationBuilder.Build();

        // Build service collection
        var serviceCollection = new ServiceCollection()
            .AddSingleton<IConfiguration>(configuration);
        
        // Build logging
        serviceCollection.AddLogging(loggingBuilder =>
        {
            loggingBuilder.ClearProviders();
            loggingBuilder.AddConfiguration(configuration.GetSection("Logging"));
            loggingBuilder.AddConsole();
            loggingBuilder.AddFile(configuration.GetSection("Serilog"));
        });

        // Register services from other libraries (optional)
        DependencyHelper.RegisterServices(serviceCollection, configuration);

        // Return built service provider
        return serviceCollection.BuildServiceProvider();
    }
}