feat: add listen port from env

Endpoint/Program.cs

@@ -16,6 +16,7 @@ using Mirea.Api.Endpoint.Middleware;
 using Mirea.Api.Security.Services;
 using System;
 using System.IO;
+using Microsoft.AspNetCore.Hosting;
 
 namespace Mirea.Api.Endpoint;
 
@@ -66,6 +67,15 @@ public class Program
             });
         });
 
+        if (!string.IsNullOrEmpty(builder.Configuration.GetValue<string>("INTERNAL_PORT")))
+        {
+            builder.WebHost.ConfigureKestrel(options =>
+            {
+                options.ListenLocalhost(
+                    int.Parse(builder.Configuration.GetValue<string>("INTERNAL_PORT")!));
+            });
+        }
+
         builder.Services.Configure<ForwardedHeadersOptions>(options =>
         {
             var secretForward = builder.Configuration.Get<GeneralConfig>();