Override/Add S3_BUCKET variable via anchors

[Nenad Domuz]

I have multiple buckets defined which are targeted based on the branch I'm using. I have defined an anchored step like so:

- step: &bucket-upload
    name: Upload to S3
      deployment: test
      script:
        - pipe: atlassian/aws-s3-deploy:0.4.0
          variables:
            AWS_ACCESS_KEY_ID: $AWS_DEV_ACCESS_KEY
            AWS_SECRET_ACCESS_KEY: $AWS_DEV_SECRET
            AWS_DEFAULT_REGION: $AWS_DEFAULT_REGION
            S3_BUCKET: 'one-of-the-buckets'
            LOCAL_PATH: 'client/dist/client'
            ACL: 'public-read'
            DELETE_FLAG: 'true'

Is there any non-hack way to override the variable  when defining the pipeline? I've tried before and nothing happens, even tried ommiting the variable completely.

e.g.

pipelines:
  branches:
    develop:
      - step:
        <<: *bucket-upload
        deployment: test
        S3_BUCKET: 'dev-bucket'
    master:
      - step:
        <<: *bucket-upload
        deployment: prod
        S3_BUCKET: 'master-bucket'

[Abryan Manalansang]

@Nenad Domuz -  I have same concern. I want to reuse codedeploy pipe and override the DEPLOYMENT_GROUP variable.

 master:
   - step: *build
   - step:
       <<: *deploy
       name: Deploy to Prod
       deployment: production
       trigger: manual
       script:
         variables:
           DEPLOYMENT_GROUP: 'production-deployment-group'