"permission denied" from within the Container on macOS/M1 Pro

If I clone a project into the working dir ("myvolume") on the Mac M1 / outside the container, I'm not allowed to access the files inside the container afterwards:

<img width="520" alt="Bildschirmfoto 2022-04-21 um 08 33 07" src="https://user-images.githubusercontent.com/83344/164389143-710c6a71-e329-452c-9d21-268270b73231.png">
