Unable to rebuild discourse due to no space left on device

Installation
26

This is what the commands show:

root@forum:~# df -h 
Filesystem                 Size  Used Avail Use% Mounted on
udev                       7.9G     0  7.9G   0% /dev
tmpfs                      1.6G  169M  1.5G  11% /run
/dev/disk/by-label/DOROOT  315G  277G   22G  93% /
tmpfs                      7.9G  4.9M  7.9G   1% /dev/shm
tmpfs                      5.0M     0  5.0M   0% /run/lock
tmpfs                      7.9G     0  7.9G   0% /sys/fs/cgroup
cgmfs                      100K     0  100K   0% /run/cgmanager/fs
none                       315G  277G   22G  93% /var/lib/docker/aufs/mnt/990236bd36313269b6683947dc21241f4387b2671676e8fdf68de05c0fb3e0f4
shm                        512M   22M  491M   5% /var/lib/docker/containers/4684612f16f4f31589ae8075145bcde0e6e9576a22eaef3952e9d47986999b91/shm
tmpfs                      1.6G     0  1.6G   0% /run/user/0
root@forum:~# du -hs /var/discourse/shared/*
215G    /var/discourse/shared/standalone
root@forum:~# du -hs /var/discourse/shared/standalone
215G    /var/discourse/shared/standalone

If it’s a local storage issue, can I simply add block storage (Volumes) to the DigitcalOcean Droplet?

Thank you!