Install Horilla on Hetzner Ubuntu Server

I need help to install Horilla on a Hetzner cloud server running Ubuntu. I also need help to do the settings so I can connect a subdomain to the installed Horilla application.

Requirements:
- Full installation of Horilla from scratch
- Configuration to connect a subdomain

Ideal Skills & Experience:
- Experience with Horilla and Hetzner cloud servers
- Proficiency in Ubuntu server management
- Knowledge in DNS and subdomain configuration