Docker non-root access volume for runtime image

FROM mcr.microsoft.com/dotnet/runtime:8.0 AS base

USER app
RUN mkdir /home/app/data
WORKDIR /home/app

COPY ./publish .

ENTRYPOINT ["dotnet", "MyProject.dll"]

 docker run --rm \
    -v ./testdata:/home/app/data \
    -e RUN_ON_STARTUP=true \
    $image_name