Add Dockerfile

Dockerfile

+FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base
+USER $APP_UID
+WORKDIR /app
+EXPOSE 8080
+EXPOSE 8081
+
+FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+ARG BUILD_CONFIGURATION=Release
+WORKDIR /src
+COPY ["Rendelosch/Rendelosch.csproj", "Rendelosch/"]
+RUN dotnet restore "Rendelosch/Rendelosch.csproj"
+COPY . .
+WORKDIR "/src/Rendelosch"
+RUN dotnet build "Rendelosch.csproj" -c $BUILD_CONFIGURATION -o /app/build
+
+FROM build AS publish
+ARG BUILD_CONFIGURATION=Release
+RUN dotnet publish "Rendelosch.csproj" -c $BUILD_CONFIGURATION -o /app/publish /p:UseAppHost=false
+
+FROM base AS final
+WORKDIR /app
+COPY --from=publish /app/publish .
+ENTRYPOINT ["dotnet", "Rendelosch.dll"]
+ 
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