bittorrent.lizard lacks space for uploading both .img and .iso

/dev/mapper/vg1-root on rsync.lizard is too small to allow uploading
both the .img and .iso at the same time, i.e. the big chunk of shell script in the releases process for uploading is broken and this part must be done manually (like I had to do for 3.12~rc1).

Parent Task: #15993 (closed)

Original created by @anonym on 16377 (Redmine)