not all allocated diskspace used by VM

[knmcguire]

The VM upon startup, seems to only have 3.5 Gb available even though there is more disk available. Some users in the discussions are hitting that limitation: https://github.com/orgs/bitcraze/discussions/1085

These commands to extend the disk space for the filesystem needs to be added (credit to @ataffanel )

sudo lvextend -l +100%FREE /dev/ubuntu-vg/ubuntu-lv
sudo resize2fs /dev/ubuntu-vg/ubuntu-lv

This needs to be redone every time the user adds more disks through the virtual machine disk manager and have added it through gparted or something similar.

[ataffanel]

Let's fix it when releasing the new VM version.