contrib: adjust heptapod CI flavor sizes
Our CI currently runs on a number of different runners, some of which are run
by Clever Cloud.
By setting this environement variable, we're asking for a smaller size runner
for our smaller jobs, which puts less load on the Clever Cloud infrastructure,
while not affecting our overall pipeline times.
lib - sys sys
mercurial - sys sys
hgrc.d - sys sys
9diff.rc - sys sys
factotum.rc - sys sys
rc - sys sys
bin - sys sys
9diff - sys sys
hg - sys sys
sys - sys sys
lib - sys sys
python - sys sys
lib - sys sys
python2.5 - sys sys
site-packages - sys sys
hgext - sys sys
+ - sys sys
mercurial - sys sys
+ - sys sys
mercurial-VERSION-py2.5.egg-info - sys sys
src - sys sys
cmd - sys sys
hg - sys sys
+ - sys sys