Update Dockerfile

Server/Dockerfile

@@ -1,6 +1,6 @@
 #See https://aka.ms/containerfastmode to understand how Visual Studio uses this Dockerfile to build your images for faster debugging.
 
-FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base
+FROM mcr.microsoft.com/dotnet/aspnet:9.0 AS base
 ARG TAG_NAME
 WORKDIR /app
 EXPOSE 8080
@@ -12,7 +12,7 @@ COPY ./Server/ngnix-proxy-TestCA.cer /etc/ssl/certs
 RUN update-ca-certificates
 
 
-FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
 WORKDIR /src
 
 ENV GCPDeploy=true
@@ -26,18 +26,18 @@ COPY ["Server/UdapEd.Server.csproj", "Server/"]
 COPY ["Client/UdapEd.Client.csproj", "Client/"]
 COPY ["Shared/UdapEd.Shared.csproj", "Shared/"]
 
-RUN dotnet restore -p:TargetFramework=net8.0 "Shared/UdapEd.Shared.csproj"
-RUN dotnet restore -p:TargetFramework=net8.0 "Server/UdapEd.Server.csproj"
-RUN dotnet restore -p:TargetFramework=net8.0 "Client/UdapEd.Client.csproj" 
+RUN dotnet restore -p:TargetFramework=net9.0 "Shared/UdapEd.Shared.csproj"
+RUN dotnet restore -p:TargetFramework=net9.0 "Server/UdapEd.Server.csproj"
+RUN dotnet restore -p:TargetFramework=net9.0 "Client/UdapEd.Client.csproj" 
 COPY . .
 
-RUN dotnet build "Server/UdapEd.Server.csproj" -p:TargetFramework=net8.0 -c Release --no-restore -o /app/build 
+RUN dotnet build "Server/UdapEd.Server.csproj" -p:TargetFramework=net9.0 -c Release --no-restore -o /app/build 
 
 
 FROM build AS publish
 ARG TAG_NAME
 ENV UseMauiEssentials=false
-RUN dotnet publish "Server/UdapEd.Server.csproj" -p:TargetFramework=net8.0  -c Release --no-restore -o /app/publish /p:UseAppHost=false 
+RUN dotnet publish "Server/UdapEd.Server.csproj" -p:TargetFramework=net9.0  -c Release --no-restore -o /app/publish /p:UseAppHost=false 
 
 FROM base AS final
 WORKDIR /app