Attempt to sidestep too many open files problem on CI
Attempt to sidestep too many open files problem on CI

tarcieri/celluloid,dilumn/celluloid,jasonm23/celluloid,jstoja/celluloid,olleolleolle/celluloid,seuros/celluloid,davydovanton/celluloid,TiagoCardoso1983/celluloid,celluloid/celluloid,kenichi/celluloid,mehta/celluloid,sideci-sample/sideci-sample-celluloid,marshall-lee/celluloid