Decrease I/O load created by isotesters on lizard
Even with 23G of RAM per isotester, contrary to what I believed earlier
(tails#8681 (closed)), our isotesters are the biggest consumers of I/O write, and
/tmp/TailsToaster ext4 volume seems to be at fault. I’m trying
to mount a tmpfs on there, we’ll see how it goes.
Parent Task: #11009 (closed)