Fixed wrong docker base image

Author: cschlesselmann

Dockerfile

@@ -10,7 +10,7 @@ COPY . ./
 RUN dotnet publish -c Release -o out
 
 # Build runtime image
-FROM mcr.microsoft.com/dotnet/core/aspnet:2.2
+FROM mcr.microsoft.com/dotnet/core/runtime:2.2
 WORKDIR /app
 COPY --from=build-env /app/out .
 ENTRYPOINT ["dotnet", "zobo.dll"]