use official haskell image for base of Dockerfile
use official haskell image for base of Dockerfile

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