After creating an account (browse to Docker Hub), you will need to add your account credentials to 'overrides.yaml'1 (check group vars for the key names; they are 'docker_*').
Please do not use your actual password; instead, go to your Docker Hub Security settings page, and click the "New Access Token" button to create a new token to use in place of your password.
You should end up with something like
docker_id: myname
docker_password: 2daf3987-fa45-4cab-365d-a454bcd365ef
docker_email: me@work.ez
in 'overrides.yaml'. From there, proceed with
ansible-playbook deploy.yaml -i <inventory file> -e @overrides.yaml
Footnotes
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Create it if it doesn't exist ↩