anchor.diff:  
   This approach requires:
   
  -1. A regular process (eg. nightly) that mirrors the Docker images you need
  -2. Updating all pipelines to use the mirrored GCR image (eg from `nginx:1.14.2`
  +1. A regular process (e.g. nightly) that mirrors the Docker images you need
  +2. Updating all pipelines to use the mirrored GCR image (e.g. from `nginx:1.14.2`
      to `gcr.io/<GCR_PROJECT>/nginx:1.14.2`)
   
   ## Mirroring Docker images into AWS Elastic Container Registry
  
positive.code: DOCKER_LOGIN_PASSWORD="the-password"
  ```
  
  ## Other Buuildkite agents authenticating with a paid Docker Hub account
  
  All agents check the local filesystem for [hook scripts to execute during a job](/docs/agent/v3/hooks).
  
  
negative.code: * https://github.com/rpardini/docker-registry-proxy
  
  Once the caching registry is operating, pipelines can be updated to use images
  from that registry (e.g. from `nginx:1.14.2` to `example.com/nginx:1.14.2`) and
  new images will be transparently fetched from Docker Hub.
  