Configure a credential helper to remove this warning. See
https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Login Succeeded
$ export IMAGE_TAG=${CI_COMMIT_TAG:-latest}
$ docker build -t $DOCKER_REGISTRY/$CI_PROJECT_NAMESPACE/$CI_PROJECT_NAME:$IMAGE_TAG .
Sending build context to Docker daemon  1.261MB

Error response from daemon: Error processing tar file(exit status 1): write /.git/objects/5a/5463c9068d167c9c13f77439cd4485261a92e2: no space left on device
section_end:1574929135:build_script
section_start:1574929135:after_script
section_end:1574929135:after_script
section_start:1574929135:upload_artifacts_on_failure
section_end:1574929135:upload_artifacts_on_failure
ERROR: Job failed: exit status 1