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

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?
time="2021-02-11T17:36:01Z" level=error msg="failed to dial gRPC: cannot connect to the Docker daemon. Is 'docker daemon' running on this host?: dial tcp 127.0.0.1:2375: connect: connection refused"
section_end:1613064962:step_script
section_start:1613064962:cleanup_file_variables
Cleaning up file based variables
section_end:1613064962:cleanup_file_variables
ERROR: Job failed: command terminated with exit code 1