scripts/build-docker: build both gcr.io and quay.io images
scripts/build-docker: build both gcr.io and quay.io images

Signed-off-by: Gyu-Ho Lee <3454051ee3341eb69bdf6fca40899cdad4d86496@gmail.com>

etcd-io/etcd,vimalk78/etcd,gyuho/etcd,fanminshi/etcd,sebrandon1/etcd,rnaveiras/etcd,li-ang/etcd,sebrandon1/etcd,coreos/etcd,xiang90/etcd,lorneli/etcd,rnaveiras/etcd,ajityagaty/etcd,joshix/etcd,sinsharat/etcd,fanminshi/etcd,rnaveiras/etcd,coreos/etcd,mkumatag/etcd,bluebreezecf/etcd,ajityagaty/etcd,etcd-io/etcd,glevand/coreos--etcd,joshix/etcd,mqliang/etcd,glevand/coreos--etcd,dannysauer/etcd,lorneli/etcd,mqliang/etcd,ajityagaty/etcd,etcd-io/etcd,gyuho/etcd,cockroachdb/etcd,cockroachdb/etcd,heyitsanthony/etcd,bdarnell/etcd,whuwxl/etcd,whuwxl/etcd,xiang90/etcd,vimalk78/etcd,mqliang/etcd,mkumatag/etcd,sinsharat/etcd,bdarnell/etcd,heyitsanthony/etcd,dannysauer/etcd,mkumatag/etcd,bluebreezecf/etcd,li-ang/etcd