debian11: Add virtiofs as a supported device
virtiofs has been added to 5.4 kernel [0] which is supported by Debian 11 (kernel 5.10)
Issue #96 (closed) also asked to add in debian10 but initial kernel version of debian10 is kernel 4.9
Tested with Debian11 live image
sudo virt-install \
--name debian11 \
--memory 4096 \
--cpu host \
--cdrom $HOME/images/debian-live-11.4.0-amd64-gnome.iso \
--os-variant debian11 \
--memorybacking source.type=memfd,access.mode=shared \
--filesystem driver.type=virtiofs,source.dir=/tmp/,target.dir=myfolder \
--transient \
--destroy-on-exit