<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.2</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <Content Include="appsettings.json">
      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
    </Content>
  </ItemGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Extensions.Configuration.EnvironmentVariables" Version="2.2.4" />
    <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="2.2.0" />
    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="2.2.0" />
    <PackageReference Include="Microsoft.Extensions.Hosting" Version="2.2.0" />
    <PackageReference Include="Microsoft.Extensions.Logging.Console" Version="2.2.0" />
    <PackageReference Include="Microsoft.Extensions.Logging.Debug" Version="2.2.0" />
    <PackageReference Include="Serilog.Extensions.Logging" Version="2.0.4" />
    <PackageReference Include="Serilog.Settings.Configuration" Version="3.1.0" />
    <PackageReference Include="Serilog.Sinks.Elasticsearch" Version="7.1.0" />
  </ItemGroup>

</Project>

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "System": "Error",
      "Microsoft": "Error"
    }
  },
  "Serilog": {
    "MinimumLevel": "Warning",
    "WriteTo": [
      {
        "Name": "Elasticsearch",
        "Args": {
          "nodeUris": "http://127.0.0.1:9200",
          "indexFormat": "consoleapp-{0:yyyy.MM.dd}",
          "autoRegisterTemplate": true
        }
      }
    ]
  },
  "ConnectionStrings": {
    "Redis": "127.0.0.1:6379"
  }
}

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using Serilog;
using System;
using System.IO;
using System.Threading;

namespace Example
{
    /// <summary>
    /// Main program
    /// </summary>
    class Program
    {
        /// <summary>
        /// Main entry
        /// </summary>
        /// <param name="args"></param>
        static void Main(string[] args)
        {
            var environmentName = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");

            var configuration = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddEnvironmentVariables("ASPNETCORE_")
                .AddJsonFile("appsettings.json", true)
                .AddJsonFile($"appsettings.{ environmentName}.json", true)
                .AddEnvironmentVariables()
                .Build();

            Log.Logger = new LoggerConfiguration()
                .ReadFrom.Configuration(configuration)
                .CreateLogger();

            var services = new ServiceCollection()
                .AddLogging((loggingBuilder) =>
                {
                    loggingBuilder.AddConfiguration(configuration);
                    loggingBuilder.AddSerilog();

                    if (environmentName == EnvironmentName.Development)
                    {
                        loggingBuilder.AddDebug();
                    }

                    loggingBuilder.AddConsole();
                });

            //Register ConnectionStrings section
            services.Configure<ConnectionStrings>(configuration.GetSection("ConnectionStrings"));
            services.AddSingleton<IRedisLib, RedisLib>();

            services.AddSingleton<Synchronizer>();

            var serviceProvider = services.BuildServiceProvider();
            serviceProvider.GetService<Synchronizer>().Sync(environmentName).Wait(Timeout.Infinite);
        }
    }
}

<code class="shell">FROM alpine:xxx

apk upgrade --update-cache --available && \
    apk add openssl && \
    rm -rf /var/cache/apk/*
...

FROM debian:buster-slim

apt upgrade openssl
...