This is the ls logs from within the container.

82951fae383c:~# ls -al /dev/dri/
by-path/    card0       card1       card2       card3       renderD128  renderD129
82951fae383c:~# ls -al /dev/dri/
total 0
drwxr-xr-x  3 root root         180 Jan  7 09:25 .
drwxr-xr-x 20 root root        5140 Jan  7 09:25 ..
drwxr-xr-x  2 root root         160 Jan  7 09:25 by-path
crw-rw----  1 root display 226,   0 Jan  7 09:25 card0
crw-rw----  1 root display 226,   1 Jan  7 09:25 card1
crw-rw----  1 root display 226,   2 Jan  7 09:25 card2
crw-rw----  1 root display 226,   3 Jan  7 09:25 card3
crw-rw----  1 root display 226, 128 Jan  7 09:25 renderD128
crw-rw----  1 root display 226, 129 Jan  7 09:25 renderD129
82951fae383c:~# systemctl status weston@display
* weston@display.service - Weston Wayland Compositor
     Loaded: loaded (/lib/systemd/system/weston@.service; static; vendor preset: disabled)
    Drop-In: /lib/systemd/system/weston@.service.d
             `-weston-init.conf
     Active: failed (Result: exit-code) since Thu 2021-01-07 09:28:44 UTC; 8min ago
    Process: 847 ExecStart=/usr/bin/agl-compositor --config /etc/xdg/weston/weston.ini --idle-time=0 --tty=7 --log=/run/platform/display/compositor.log (code=exited, status=1/FAILURE)
   Main PID: 847 (code=exited, status=1/FAILURE)

Jan 07 09:28:44 82951fae383c systemd[1]: Starting Weston Wayland Compositor...
Jan 07 09:28:44 82951fae383c systemd[1]: weston@display.service: Main process exited, code=exited, status=1/FAILURE
Jan 07 09:28:44 82951fae383c systemd[1]: weston@display.service: Failed with result 'exit-code'.
Jan 07 09:28:44 82951fae383c systemd[1]: Failed to start Weston Wayland Compositor.
Jan 07 09:28:44 82951fae383c agl-compositor[847]: [09:28:44.592] fatal: failed to create compositor backend.
Jan 07 09:28:44 82951fae383c agl-compositor[847]: Internal warning: debug scope 'drm-backend' has not been destroyed.
Jan 07 09:28:44 82951fae383c systemd[1]: Starting Weston Wayland Compositor...
Jan 07 09:28:44 82951fae383c systemd[1]: weston@display.service: Main process exited, code=exited, status=1/FAILURE
Jan 07 09:28:44 82951fae383c systemd[1]: weston@display.service: Failed with result 'exit-code'.
Jan 07 09:28:44 82951fae383c systemd[1]: Failed to start Weston Wayland Compositor.
82951fae383c:~# cat /run/platform/display/compositor.log
cat: /run/platform/display/compositor.log: No such file or directory
82951fae383c:~#