[Stack Overflow q65806330]: 'You have reached your pull rate limit' during a CodeBuild build means the build environment pulled a base image anonymously from Docker Hub too many times. Fix it by authenticating pulls with Docker Hub credentials in the build project, or by hosting the image in ECR (or ECR Public) and referencing that instead. Caching the image or using a custom CodeBuild image stored in ECR avoids repeated anonymous pulls entirely.

Context: Anonymous image pulls from Docker Hub are rate-limited. CodeBuild builds hit it fast.