Gitlab CI example for MultiArch images

.gitlab-ci.yml

image: docker:latest

variables:
  DOCKER_BUILDKIT: 1

services:
  - docker:dind

build:
  before_script:
    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
  script:
    # https://github.com/docker/buildx/issues/413
    - docker context create multiarch-context
    - docker buildx create --name multiarch-builder --use multiarch-context --bootstrap
    - docker buildx build --push --platform linux/arm64,linux/amd64 --tag $CI_REGISTRY_IMAGE:latest .