What is the best way to deploy N almost identical sites on the server?

Question

Chef

Actually, for the first time we set the task to deploy * twenty sites on one engine with minimal differences in configs.
Briefly: there is a git repository with an engine that needs to be downloaded, migrated (a separate database is created for each site with the appropriate separation of rights), create a vhost in nginx with Varnish and a couple more applications. Sites from each other must be independent for security purposes. And, of course, then the question of mass rolling out updates from the git will arise.
Poke, please, with your nose where to dig. Some "best practices".
Docker, Chef, Ansible?

Answer 1

Salt Stack & Docker+Compose

Answer 2

I did it with Ansible.
Example