[Updated] Authenticate with Docker to avoid impact of Nov. 1st rate limits

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I’m using YAML’s merge feature to reduce duplication in a given config file. For instance:

version: 2.1

docker-auth: &docker-auth
  auth:
    username: $DOCKERHUB_USERNAME
    password: $DOCKERHUB_PASSWORD

workflows:
  version: 2
  workflow:
    jobs:
      - job1:
          context: dockerhub
      - job2:
          context: dockerhub

jobs:
  job1:
    docker:
      - image: circleci/whatever
        <<: *docker-auth
    steps:
      - checkout
  job2:
    docker:
      - image: circleci/whatever
        <<: *docker-auth
    steps:
      - checkout
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