https://docs.docker.com/engine/reference/commandline/login/#credentials-store

Login Succeeded
Building Heroku-based application using gliderlabs/herokuish docker image...
Cannot connect to the Docker daemon at tcp://localhost:2375. Is the docker daemon running?
Cannot connect to the Docker daemon at tcp://localhost:2375. Is the docker daemon running?
Cannot connect to the Docker daemon at tcp://localhost:2375. Is the docker daemon running?
section_end:1613146596:step_script
section_start:1613146596:cleanup_file_variables
Cleaning up file based variables
section_end:1613146596:cleanup_file_variables
ERROR: Job failed: command terminated with exit code 1