mount: mount as 777 for max compat

for cifs, file_mode can be 666

src/scripts/addmount.sh

@@ -34,5 +34,6 @@ systemctl daemon-reload
 # systemd can automatically create the "where" dir but the backup logic relies on permissions
 mkdir -p "${where}"
 chown yellowtent:yellowtent "${where}" || true # this can fail with nfs+root_squash
+chmod 777 "${where}" # this allows all users to read and write
 
 systemctl enable --no-block --now "${mount_filename}" || true