Update container port to 8080 and add missing using directive for IWebHost

Author: caunt

.github/workflows/publish-container.yml

@@ -34,4 +34,4 @@ jobs:
         env:
           ContainerRegistry: ghcr.io
           ContainerRepository: caunt/ecoflow-mqtt-api
-          ContainerPort: 80
+          ContainerPort: 8080

src/EntryPoint.cs

@@ -3,6 +3,7 @@
 using EcoFlow.Mqtt.Api.Extensions;
 using EcoFlow.Mqtt.Api.Services;
 using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;