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

Good news!

CircleCI has partnered with Docker to ensure that our users can continue to access Docker Hub without rate limits. On November 1st, with few exceptions, you should not be impacted by any rate limits when pulling images from Docker Hub through CircleCI.

However, these rate limits may go into effect for CircleCI users in the future. That’s why we’re encouraging you and your team to add Docker Hub authentication to your CircleCI configuration and consider upgrading your Docker Hub plan, as appropriate, to prevent any impact from rate limits in the future.