Several images not getting built

[ry4nz]

Checking the Jenkins log, there are several images not getting built.

skipping "golang:1.9.1-alpine3.6" (due to architecture "s390x"; only "amd64" supported)
skipping "golang:1.9.1-windowsservercore" (due to architecture "s390x"; only "windows-amd64" supported)
skipping "golang:1.9.1-nanoserver" (due to architecture "s390x"; only "windows-amd64" supported)
skipping "golang:1.8.4-alpine3.6" (due to architecture "s390x"; only "amd64" supported)
skipping "golang:1.8.4-alpine3.5" (due to architecture "s390x"; only "amd64" supported)
skipping "golang:1.8.4-windowsservercore" (due to architecture "s390x"; only "windows-amd64" supported)
skipping "golang:1.8.4-nanoserver" (due to architecture "s390x"; only "windows-amd64" supported)

Images golang:1.9.1-alpine3.6 golang:1.8.4-alpine3.6 golang:1.8.4-alpine3.6 should be built.

[tianon]

You're looking at the logs specifically for the s390x architecture, which Alpine doesn't currently support (gliderlabs/docker-alpine#304), and Windows definitely doesn't support.

See https://doi-janky.infosiftr.net/job/multiarch/job/windows-amd64/job/golang/lastCompletedBuild/console for where the last nanoserver and windowsservercore builds were successfully processed, and https://doi-janky.infosiftr.net/job/multiarch/job/amd64/job/golang/lastCompletedBuild/console for the alpine* tags.