http://dl-cdn.alpinelinux.org/alpine/v3.7/main
http://dl-cdn.alpinelinux.org/alpine/v3.7/community
@edge http://dl-cdn.alpinelinux.org/alpine/edge/main
@edgecommunity http://dl-cdn.alpinelinux.org/alpine/edge/community
@testing http://dl-cdn.alpinelinux.org/alpine/edge/testing