heroku .net

gistfile1.txt

FROM mcr.microsoft.com/dotnet/aspnet:5.0 AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443

FROM mcr.microsoft.com/dotnet/sdk:5.0 AS build
WORKDIR /src
COPY ["todo.csproj", ""]
RUN dotnet restore "todo.csproj"
COPY . .
WORKDIR "/src/"
RUN dotnet build "todo.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "todo.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "todo.dll"]

heroku

heroku login
heroku container:login
heroku container:push web -a umc-todolist-app
heroku container:release web --app umc-todolist-app

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

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

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                    webBuilder.UseUrls("http://*:" + Environment.GetEnvironmentVariable("PORT")); 
                });
    }
}