In order to install certificates with Certbot
you need to modify pwnboard/serv/nginx.conf.
Add your domain name to the server_name setting for 443
server {
listen 443 ssl default_server;
server_name pwnboard.sample.com _;
...
}
Make sure you leave a
_after the domain name as a catch-all
Follow the certbot installation instructions to install your certificate.
When it asks if you would like a port 80 redirect, say no.
You should now restart nginx and your site will have valid certificates.