Adding instructions for device passthrough with LXC containers (unprivileged also)

[epic0421]

As of Proxmox VE 8.2, a new option was added for device passthrough. This wiki page comes to mind for adding instructions for this but cannot test this with other hardware configurations.

Another great thing about this new method is that it works with unprivileged LXC containers.

Old method of allowing access to the Intel GPU in /etc/pve/lxc/x.conf

lxc.cgroup2.devices.allow: c 226:0 rwm
lxc.cgroup2.devices.allow: c 226:128 rwm
lxc.mount.entry: /dev/dri/renderD128 dev/dri/renderD128 none bind,optional,create=file

New method of allowing access to the Intel GPU in /etc/pve/lxc/x.conf

dev0: /dev/dri/card0,gid=44
dev1: /dev/dri/renderD128,gid=104

Got the GIDs by running cat /etc/group | grep -E 'video|render' in the PVE environment

Or it can be done through the gui in the LXC container