add docker things before trying to push docker image in circleCI
add docker things before trying to push docker image in circleCI

tjcunliffe/hoverfly,tjcunliffe/hoverfly,tjcunliffe/hoverfly,SpectoLabs/hoverfly,tjcunliffe/hoverfly,tjcunliffe/hoverfly,SpectoLabs/hoverfly,tjcunliffe/hoverfly