build multi-arch docker images in circleci

config.yaml

version: 2.1

commands:

  configure-dockerhub:
    description: Configure Docker Hub access
    steps:
      - run:
          name: Configure Docker Hub
          command: |
            [ -z "$ACCESS_TOKEN" ] && exit 0
            docker login --username youraccountname --password=$ACCESS_TOKEN

jobs:

  build-x86:
    docker:
      - image: docker:latest
    steps:
      - checkout
      - setup_remote_docker
      - configure-dockerhub
      - run:
          name: Build and push Docker Image for x86
          command: |
            docker build -t yourname/yourproject:latest-x86 migrator
            docker push yourname/yourproject:latest-x86

  build-arm64:
    machine:
      image: ubuntu-2004:202101-01
    resource_class: arm.medium
    steps:
      - checkout
      - configure-dockerhub
      - run:
          name: Build and push Docker Image for arm64
          command: |
            docker build -t yourname/yourproject:latest-arm64 migrator
            docker push yourname/yourproject:latest-arm64

  push-multiarch-image:
    docker:
      - image: docker:latest
    steps:
      - checkout
      - setup_remote_docker
      - configure-dockerhub
      - run:
          name: Create and push manifest for multiarch
          command: |
            docker manifest create \
            yourname/yourproject:latest \
            --amend yourname/yourproject:latest-arm64 \
            --amend yourname/yourproject:latest-x86
            docker manifest push yourname/yourproject:latest

workflows:
  build-publish:
    jobs:
      - build-x86:
          context: dockerhubsecret # the circleci context that contain your access token to dockerhub
          filters:
            branches:
              only:
                - master
      - build-arm64:
          context: dockerhubsecret
          filters:
            branches:
              only:
                - master
      - push-multiarch-image:
          context: dockerhubsecret
          requires:
            - build-arm64
            - build-x86
          filters:
            branches:
              only:
                - master