add ca-certificates to Dockerfile
add ca-certificates to Dockerfile

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