A buildspec for CodeBuild... for cross platform building with buildx - enjoy :)

buildspec.yml

version: 0.2

phases:
  install:
    runtime-versions:
      docker: 19
    commands:
      - docker version
      - curl -JLO https://github.com/docker/buildx/releases/download/v0.4.2/buildx-v0.4.2.linux-amd64
      - mkdir -p ~/.docker/cli-plugins
      - mv buildx-v0.4.2.linux-amd64 ~/.docker/cli-plugins/docker-buildx
      - chmod a+rx ~/.docker/cli-plugins/docker-buildx
      - docker run --privileged --rm tonistiigi/binfmt --install all
  pre_build:
    commands:
      - echo Logging in to Amazon ECR...
      - aws ecr get-login-password --region $AWS_DEFAULT_REGION | docker login --username AWS --password-stdin $AWS_ACCOUNT_ID.dkr.ecr.$AWS_DEFAULT_REGION.amazonaws.com
  build:
    commands:
      - echo Build started on `date`
      - echo Building the Docker image...
      - docker buildx create --use --name crossx
      - docker buildx build --push --platform=linux/amd64,linux/arm64 -t $AWS_ACCOUNT_ID.dkr.ecr.$AWS_DEFAULT_REGION.amazonaws.com/$IMAGE_REPO_NAME:$IMAGE_TAG .

This helped me out quite a bit getting buildx to work in codebuild. This was my full command list:

- mkdir -p $HOME/.docker/cli-plugins
      - wget -O $HOME/.docker/cli-plugins/docker-buildx https://github.com/docker/buildx/releases/download/v0.10.3/buildx-v0.10.3.linux-arm64
      - chmod a+rx $HOME/.docker/cli-plugins/docker-buildx
      - docker run --privileged --rm tonistiigi/binfmt --install all
      - export DOCKER_BUILDKIT=1
      - export DOCKER_CLI_EXPERIMENTAL=enabled
      - docker buildx create --name mybuilder --use
      - docker buildx version