Just tried out that playbook to set up a staging server, and it works pretty well.
I feel like it’s a bit too magical though. I like knowing how all the software I’m using is installed and configured, and introducing another layer of abstraction makes that harder. I have particular ways things like my web server (Nginx), database servers, Let’s Encrypt (certbot), etc are configured and want to keep things that way. I think I’ll just use the Ansible playbook for the staging server, and set up the real server using the Docker containers directly, based on documentation from the upstream projects (Synapse, etc)
It looks like they have both Docker containers and Debian packages avaliable, so I’ll have to see if it’s worth using the Debian packages instead.