fix(Dockerfile): update exposed ports and add env variable

Removed EXPOSE directive for port 8081, leaving only port 8080 exposed.
Added ASPNETCORE_HTTP_PORTS environment variable set to 8080 to
ensure the application listens on the correct port. This change
simplifies port configuration and aligns runtime behavior with
the Dockerfile.

Author: SolidProgramming

AniWorldReminder_API/Dockerfile

@@ -4,9 +4,8 @@
 FROM mcr.microsoft.com/dotnet/aspnet:10.0-alpine AS base
 USER $APP_UID
 WORKDIR /app
-EXPOSE 8080
-EXPOSE 8081
 
+ENV ASPNETCORE_HTTP_PORTS=8080
 
 # Diese Stufe wird zum Erstellen des Dienstprojekts verwendet.
 FROM mcr.microsoft.com/dotnet/sdk:10.0-alpine AS build