Multiarch Go Builds

.gitlab-ci.yml

image: docker:latest
services:
  - docker:dind

stages:
  - build

variables:
  IMAGE: registry.gitlab.com/bamnet/njtdata
  DOCKER_CLI_EXPERIMENTAL: enabled

before_script:
  - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY

build:
  stage: build
  script:
    - docker build --build-arg opts="CGO_ENABLED=0 GOARCH=amd64" --pull -t $IMAGE:amd64 .
    - docker push $IMAGE:amd64
    - docker build --build-arg opts="GOARCH=arm GOARM=6" --pull -t $IMAGE:arm32v6 .
    - docker push $IMAGE:arm32v6
    - docker manifest create $IMAGE $IMAGE:amd64 $IMAGE:arm32v6
    - docker manifest annotate $IMAGE $IMAGE:arm32v6 --os linux --arch arm
    - docker manifest push $IMAGE

Dockerfile

FROM golang:alpine as builder

RUN apk update && apk add git && apk add tzdata && apk add ca-certificates

COPY . $GOPATH/src/gitlab.com/bamnet/njtdata
WORKDIR $GOPATH/src/gitlab.com/bamnet/njtdata

RUN go get -d -v
ARG opts
RUN env ${opts} go build -o /go/bin/import

FROM scratch
COPY --from=builder /usr/local/go/lib/time/zoneinfo.zip /usr/local/go/lib/time/
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
COPY --from=builder /go/bin/import /go/bin/import
ENTRYPOINT ["/go/bin/import"]
CMD []

Nice thanks for creating that gist!