This was mentioned in #27 (Github Pull Request), but it's just now that the nginx Docker image actually supports TLS v1.3 and we can enable it.
Prerequisites
Configuring your DNS server
Configuring this Ansible playbook
Installing
Registering users
Configuring service discovery via .well-known
Maintenance / checking if services work
Maintenance / upgrading services
Maintenance / upgrading PostgreSQL
Maintenance and Troubleshooting
Uninstalling