@trilobite done similar set up but with #shinobi in #proxmox . I think you need to create some mount binding in order to make shares available in the LXC. Here is a link for a tutorial.
https://www.itsembedded.com/sysadmin/proxmox/_bind/_unprivileged/_lxc/
@nico198x dav server for contacts and calendar so its radicale