Program.cs

using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Serilog;
using Microsoft.Extensions.Configuration;

namespace WorkerTest {
    public class Program {

        IConfiguration config { get; set; }

        public static void Main(string[] args) {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>

            Host.CreateDefaultBuilder(args)

                // Agregar serilog para uso global
                .UseSerilog((hostingContext, loggerConfiguration) =>
                    loggerConfiguration.ReadFrom.Configuration(hostingContext.Configuration))

                .ConfigureServices((hostContext, services) => {
                    services.AddHostedService<Worker>();
                });
    }
}