Add startup to normally set-up a webhost

Dockerfile

@@ -3,8 +3,7 @@
 FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base
 USER app
 WORKDIR /app
-EXPOSE 8080
-EXPOSE 8081
+EXPOSE 80
 
 FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
 ARG BUILD_CONFIGURATION=Release

Program.cs

@@ -5,32 +5,13 @@ namespace OembedTests
     {
         public static void Main(string[] args)
         {
-            var builder = WebApplication.CreateBuilder(args);
-
-            // Add services to the container.
-
-            builder.Services.AddControllers();
-            // Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
-            builder.Services.AddEndpointsApiExplorer();
-            builder.Services.AddSwaggerGen();
-
-            var app = builder.Build();
-
-            // Configure the HTTP request pipeline.
-            if (app.Environment.IsDevelopment())
-            {
-                app.UseSwagger();
-                app.UseSwaggerUI();
-            }
-
-            app.UseHttpsRedirection();
-
-            app.UseAuthorization();
-
-
-            app.MapControllers();
-
-            app.Run();
+            Host.CreateDefaultBuilder(args)
+                .ConfigureWebHostDefaults(k =>
+                {
+                    k.ConfigureKestrel(l => l.ListenAnyIP(80));
+                    k.UseStartup<Startup>();
+                })
+                .Build().Run();           
         }
     }
 }

Startup.cs

@@ -0,0 +1,47 @@
+namespace OembedTests
+{
+    public class Startup
+    {
+        private readonly IConfiguration configuration;
+        public static IServiceProvider serviceProvider;
+        
+        public Startup()
+        {
+            configuration = new ConfigurationBuilder()
+                .AddEnvironmentVariables(prefix: "m.")
+                .AddJsonFile("appsettings.json", optional: true)
+                .Build();
+        }
+
+        public void ConfigureServices(IServiceCollection services)
+        {
+            services.AddControllers();
+
+            services
+                .AddSwaggerGen()
+                .AddSingleton(configuration)
+                .AddEndpointsApiExplorer();
+
+        }
+
+        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
+        {
+            
+            
+            app.UseDeveloperExceptionPage();
+            app.UseSwagger();
+            app.UseSwagger(c =>
+            {
+                c.RouteTemplate = "/swagger/v1/swagger.json";
+            });
+            
+            app.UseStaticFiles();
+            app.UseRouting();
+            app.UseCors(k => { k.AllowAnyHeader(); k.AllowAnyMethod(); k.AllowAnyOrigin(); k.WithMethods("POST", "GET"); });
+            app.UseEndpoints(endpoints =>
+            {
+                endpoints.MapControllers();
+            });
+        }
+    }
+}