Update .gitlab-ci.yml file

# https://levelup.gitconnected.com/build-multi-arch-docker-images-ef8b3c859a1e

# https://gist.github.com/kris-g/6bfd5f1d813a8f2276b5759f9a8d65ee

# https://gruuuuu.github.io/cloud/1multiarch-docker/

# https://aymdev.io/en/blog/post/using-cache-in-gitlab-ci-with-docker-in-docker

image: docker:stable

variables:

  stage: build

  tags:

    - amd64

  script:

    - wget -O /usr/bin/docker-buildx

      https://github.com/docker/buildx/releases/download/${BUILDX_VERSION}/buildx-${BUILDX_VERSION}.${BUILDX_ARCH}

    - chmod +x /usr/bin/docker-buildx

    - docker-buildx create --use

    - docker-buildx version

    - docker info

  before_script:

    - mkdir -p $HOME/.docker/cli-plugins/

    - wget -O $HOME/.docker/cli-plugins/docker-buildx https://github.com/docker/buildx/releases/download/${BUILDX_VERSION}/buildx-${BUILDX_VERSION}.${BUILDX_ARCH}

    - chmod +x $HOME/.docker/cli-plugins/docker-buildx

    - docker run --privileged --rm tonistiigi/binfmt --install all

    - docker buildx create --use

    # For debuging

    # - docker buildx inspect --bootstrap ${BUILDX_BUILDER}

    # - docker buildx ls

    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY

    - docker-buildx build

      --platform linux/arm/v7,linux/arm64/v8,linux/amd64

  script:

    # For caching pre-pulled image

    - docker pull $CI_REGISTRY_IMAGE:latest || true

    - docker buildx build --cache-from ${CI_REGISTRY_IMAGE}:latest

      --platform linux/arm/v7,linux/arm64/v8,linux/amd64,linux/ppc64le,linux/s390x,linux/386

      -t ${CI_REGISTRY_IMAGE}:latest

      -f ./Dockerfile

      --push

      .

    - docker push $CI_REGISTRY_IMAGE:latest