use --diff=none for debmirror
use --diff=none for debmirror

Diffs are slow and consist of many files. Our server bandwidth is high
and we infrequently update, so don’t use diffs at all.

jamessan/dcs,jamessan/dcs,jamessan/dcs,jamessan/dcs,lamby/dcs,lamby/dcs,lamby/dcs,lamby/dcs