Dockerfile: fix use -y with install
Dockerfile: fix use -y with install

mkscrg/persistent,pseudonom/persistent,gbwey/persistent,jasonzoladz/persistent,meteficha/persistent,superduper/persistent,yesodweb/persistent,pseudonom/persistent,mitchellwrosen/persistent,andrewthad/persistent,greydot/persistent,andrewthad/persistent,mkscrg/persistent,creichert/persistent,nakaji-dayo/persistent,superduper/persistent,bitemyapp/persistent,rdnetto/persistent,superduper/persistent,mitchellwrosen/persistent,paul-rouse/persistent,plow-technologies/persistent,psibi/persistent,rdnetto/persistent,meteficha/persistent,andrewthad/persistent,nakaji-dayo/persistent,mkscrg/persistent,nakaji-dayo/persistent,greydot/persistent,jasonzoladz/persistent,gbwey/persistent,erikd/persistent,greydot/persistent,gbwey/persistent,jasonzoladz/persistent,naushadh/persistent,meteficha/persistent,mitchellwrosen/persistent