WARNING! Your password will be stored unencrypted in /root/.docker/config.json. Configure a credential helper to remove this warning. See https://docs.docker.com/engine/reference/commandline/login/#credentials-store
$ docker build --pull -t $TEST_IMAGE . Sending build context to Docker daemon 78.85kB
Step 1/2 : FROM centos7 pull access denied for centos7, repository does not exist or may require 'docker login': denied: requested access to the resource is denied ERROR: Job failed: exit code 1
