Makefile: increase vm image size to 20 G
Makefile: increase vm image size to 20 G

weldr/welder-web,jkozol/welder-web,jkozol/welder-web,weldr/welder-web,jkozol/welder-web,weldr/welder-web,weldr/welder-web,jkozol/welder-web