[syncthing] use mounted disks to store data

[AzonInc]

Which addon?

Syncthing

Is your feature request related to a problem? Please describe.

Describe the solution you'd like

It would be great to be able to use mounted disks like sda1 inside the syncthing container to store the files.

Describe alternatives you've considered
I used the Resilio Sync Addon which is mounting all attached disks in the container.
It would be a great addition to the Syncthing Addon.

Additional context

[salim-b]

@AzonInc Did you read the add-on documentation?

tl;dr: You have to mount your disks underneath a top-level directory that is mapped into the add-on container (like /mnt/data/supervisor/media/ in the HA host which maps to /media/ inside the add-on container).

[AzonInc]

Yes I did.
But I got two issues using it that way.

The storage occupancy seems to be unreliable when using a mount inside one of those folders and also it's included in full backups which isn't useful at all with a 1tb drive attached. For that reason full backups are failing all the time.

Syncthing stops syncing because it thinks /share is full due to the mount within the share folder.

With the resiliosync addon I didn't have such problems because I could mount the disk directly which solved the issues mentioned above.