How to use pipes on ARM workers

[Darko Miletic]

I have a pipeline for building docker image that has step for x86 and arm

It looks like this

pipelines:
  custom:
    construct:
      - step:
          name: 'Build x86_64 image'
          image: 'atlassian/default-image:4'
          runtime:
            cloud:
              arch: 'x86'
          services:
            - 'docker'
          caches:
            - 'docker'
          script:
            - >-
              bash
              "$BITBUCKET_CLONE_DIR/build-image"
              "${BRANCH:-master}"
              "$REPO"
              "${AWS_ECR_NAME}-x86_64"
              "$BITBUCKET_CLONE_DIR"
              "${IMAGE_TAGS:-latest}"
            - pipe: 'atlassian/aws-ecr-push-image:2.5.0'
              variables:
                AWS_ACCESS_KEY_ID: $AWS_ACCESS_KEY_ID
                AWS_SECRET_ACCESS_KEY: $AWS_SECRET_ACCESS_KEY
                AWS_DEFAULT_REGION: $AWS_DEFAULT_REGION
                IMAGE_NAME: "${AWS_ECR_NAME}-x86_64"
                TAGS: "${IMAGE_TAGS:-latest}"
      - step:
          name: 'Build aarch64 image'
          image: 'atlassian/default-image:4'
          runtime:
            cloud:
              arch: 'arm'
          services:
            - 'docker'
          caches:
            - 'docker'
          script:
            - >-
              bash
              "$BITBUCKET_CLONE_DIR/build-image"
              "${BRANCH:-master}"
              "$REPO"
              "${AWS_ECR_NAME}-aarch64"
              "$BITBUCKET_CLONE_DIR"
              "${IMAGE_TAGS:-latest}"
            - pipe: 'atlassian/aws-ecr-push-image:2.5.0'
              variables:
                AWS_ACCESS_KEY_ID: $AWS_ACCESS_KEY_ID
                AWS_SECRET_ACCESS_KEY: $AWS_SECRET_ACCESS_KEY
                AWS_DEFAULT_REGION: $AWS_DEFAULT_REGION
                IMAGE_NAME: "${AWS_ECR_NAME}-aarch64"
                TAGS: "${IMAGE_TAGS:-latest}"

I am getting this error on aarch64 step

WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested exec /usr/local/bin/python3: exec format error