Add Host directory to LXD container

Host directory can be mounted to a container at read-lony or read-write mode.

It looks like LXD officially support one-step configuration from some time. In the previous version, we have to go through serveral steps to mount it in read-write mode. See the conversations.

Previous version - Example

Now, we can easily define the mounting mode by tuning readonly flag.

1
lxc config device add container name disk source=/data path=/mnt/data readonly=true