Hello, I'm following your excellent service architecture section in the docker-mail-server guide. Looking at the persistent volume section, and trying to compare that to what I see in my.env and docker compose files, in my local installation, all of the entries for example Data - mail are blank. Yet it seems as if data is preserved between starting and stopping the mail server. Where actually is the default storage location in the host machine? I can't figure it out by reading your documentation. I see in your documentation the section "mda" has a line

data-mail:/srv/vmail

but neither the host or the container has /srv/ at all from the root. My host machine is running Ubuntu 24.04 LTS

I have another question, the installation of roundcube only installs one skin. I don't see where I can go to add another skin or for example a password plugin. Thank you very much.