Update Dockerfile

Dockerfile

@@ -1,4 +1,4 @@
-FROM mcr.microsoft.com/dotnet/aspnet:8.0 AS base
+FROM mcr.microsoft.com/dotnet/aspnet:9.0 AS base
 
 # Make volume dirs
 RUN for DIR in /database /manifest /builds; do mkdir $DIR; chown app: $DIR; done
@@ -7,7 +7,7 @@ USER $APP_UID
 WORKDIR /app
 EXPOSE 8080
 
-FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
 ARG BUILD_CONFIGURATION=Release
 WORKDIR /src
 COPY . .