No, it was a fresh install, using the method mentioned.
The nginx is the one included in the install.
After install, the page was not reachable. So i figured, of course, there are no ssl certificates, installed certbot and got some.
Question remaining is how to make seatable server ( i suppose the included nginx) use them.
I see, there should be something named caddy. Yet, there is nothing like that in the install or the composer files I pulled.