supinf/go repository overview

Supported tags and respective Dockerfile links: ・latest (golang/alpine/versions/1.8/Dockerfile⁠)
・1.8 (golang/alpine/versions/1.8/Dockerfile⁠) ・1.8-builder (golang/alpine/versions/1.8-builder/Dockerfile⁠)
・1.7 (golang/alpine/versions/1.7/Dockerfile⁠) ・1.7-builder (golang/alpine/versions/1.7-builder/Dockerfile⁠)
・1.6 (golang/alpine/versions/1.6/Dockerfile⁠) ・1.6-builder (golang/alpine/versions/1.6-builder/Dockerfile⁠)