How to setup Nginx to display Ruby on Rails Webpage?

While I was building my virtual petsite I followed the following articles listed below to setup my new web server. https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-ubuntu-20-04#step-1-installing-certbot https://www.digitalocean.com/community/tutorials/how-to-install-nginx-on-ubuntu-20-04 https://www.digitalocean.com/community/tutorials/initial-server-setup-with-ubuntu-22-04 https://www.digitalocean.com/community/tutorials/how-to-install-node-js-on-ubuntu-22-04#option-2-installing-node-js-with-apt-using-a-nodesource-ppa https://docs.digitalocean.com/products/droplets/how-to/tag/ https://www.writesoftwarewell.com/how-http-cookies-work-rails/ https://www.digitalocean.com/community/tutorials/how-to-install-ruby-on-rails-with-rbenv-on-ubuntu-22-04 https://www.digitalocean.com/community/tutorials/how-to-use-postgresql-with-your-ruby-on-rails-application-on-ubuntu-20-04

These articles worked really well, and I have both Ruby on Rails and Nginx active. The problem is that I am having a difficulty in getting Ruby on Rails to be displayed on https://dev.duelingpets.net.

Instead of the Ruby on Rails file, I am getting this index file from Nginx to be displayed: Success! The Duelingpets server block is working!

My current config for the nginx looks like this:

server {

        root /var/www/duelingpets.net/html;
        index index.html index.htm index.nginx-debian.html;

        server_name duelingpets.net dev.duelingpets.net;

        location / {
                try_files $uri $uri/ =404;
        }

    listen [::]:443 ssl ipv6only=on; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/duelingpets.net/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/duelingpets.net/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot


}
server {
    if ($host = dev.duelingpets.net) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    if ($host = duelingpets.net) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


        listen 80;
        listen [::]:80;

        server_name duelingpets.net dev.duelingpets.net;
    return 404; # managed by Certbot




}


duelingpets@DuelingpetsWS1:/etc/nginx/sites-available

When I try to change the root file from root /var/www/duelingpets.net/html; to root /var/www/duelingpets.net/html/Duelingpets/public, I get: 403 Forbidden:

nginx/1.24.0 (Ubuntu) Message to pop up.

I checked the permissions and they appear to be in working order. I want it to point to my Ruby on Rails website on dev.duelingpets.net but I can’t figure out how to do so. I also heard that Passenger is obsolete with the newer versions of Nginx so I was wonder what to use to get the Rails website to display in the browser?

Any advice would be greatly appreciated on how to get this to work.