send PR.
4 from them are for mariadb and redis. I felt I should explain only frappe related volumes.
https://github.com/frappe/frappe_docker/blob/4a18d57e8d6366c4279513eea8ee8e4045966958/pwd.yml#L100 change this from frontend to $$host as $$ is required to escape $ in compose.yml. Compose V1 I’ve not confirmed.
refer volumes section: Container Basics