You could do an LXC, but in your case I would spin up a small VM and install Openmediavault. Managing permissions, configuring shares (either SMB or NFS), etc. are all very easy on OMV, and you don't really need the complexity of something like TrueNAS scale. Plus OMV works pretty well with USB drives. Just don't try to configure USB drives in a raid array. Its not designed for it, and has the postential to become unstable if you do that.