LXC Commands:

Show image list to build containers from:

lxc image list

Build container from image:

 lxc launch local:symfonyapp-full-20.04 com-symfonyapp-sandbox02

Set volume mount:

lxc config device add com-symfonyapp-sandbox03 test_uploads disk source=/lxd_shared/test_uploads path=/srv/www/symfonyapp_uploads

Then check that it was added with:

lxc config show com-symfonyapp-sandbox04