How do I connect container to services in Pipelines without network=host?

[Richard Taylor]

I used to run this with --networking=host, but that's no longer viable.

I've tried both localhost and 127.0.0.1. I'm getting connection refused

options:
  docker: true

definitions:
  services:
    redis:
      image: redis
    rabbitmq:
      image: rabbitmq

pipelines:
  branches:
    master:
      - step:
          name: Build
          services:
            - redis
            - rabbitmq
          script:
            - export IMAGE=$ECR/$BITBUCKET_REPO_SLUG
            - docker build -t $IMAGE:$BITBUCKET_COMMIT .
            - docker run -e REDIS_HOST=127.0.0.1 -e AMQP_URL=amqp://127.0.0.1:5672 --entrypoint rspec $IMAGE:$BITBUCKET_COMMIT app/spec
            - docker push $IMAGE:$BITBUCKET_COMMIT