docker login credentials-store
$HOME/.docker/config.json
{
"credsStore": "simple"
}
$HOME/.docker/creds.json
{
"ServerURL": "https://index.docker.io/v1",
"Username": "david",
"Secret": "passw0rd1"
}
docker-credential-simple store < test/cred.json
docker-credential-simple get < test/url.txt
docker-credential-simple erase < test/url.txt
docker-credential-simple list