save image to artifact dir on CIRCLE_BUILD_NUM existence
save image to artifact dir on CIRCLE_BUILD_NUM existence

toli/docker-alpine,troyfontaine/armhf-alpinelinux,moul/docker-alpine,NeowayLabs/docker-alpine,pekermert/docker-alpine,gliderlabs/docker-alpine,OpenGrape/docker-alpine,13W/docker-alpine,glebofff/docker-alpine,muhmuhten/docker-alpine,neeravkumar/docker-alpine,frewsxcv/docker-alpine,gbraad/docker-alpine,lindenlab/docker-alpine,progrium/docker-alpine