Automatic addition of new domains. Also ssl is supported using certbot. All config (security files, etc.) is nginxconfig.io with no modifications

domain.sh

#!/bin/bash

domain=$1
root="/var/www/$domain"

# Clear old config if exists
rm "/etc/nginx/sites-available/$domain.conf" || true
rm "/etc/nginx/sites-enabled/$domain.conf" || true
rm -rf $root || true

block="/etc/nginx/sites-available/$domain.conf"

# Creting domain folder
sudo mkdir "/var/www/$domain"

# Create the Nginx server block file:
sudo tee $block > /dev/null <<EOF

# HTTP to HTTPS redirect
server {
    listen 80;
    server_name $domain;
    return 301 https://$domain\$request_uri;
}

server {
        listen 443 ssl http2;
        listen [::]:443 ssl http2;

        server_name $domain;
        root $root;

        # security (can be replaced with your config)
        include nginxconfig.io/security.conf;

        # index file
        index index.php index.html;

        # index.php fallback
        location / {
            try_files \$uri \$uri/ /index.php?\$query_string;
        }

        # handle .php
        location ~ \.php$ {
            include nginxconfig.io/php_fastcgi.conf;
        }

        # additional config (can be replaced with your config)
        include nginxconfig.io/general.conf;
}

EOF

# Link to make it available
sudo ln -s $block /etc/nginx/sites-enabled/

# Test configuration and reload if successful
sudo nginx -t && sudo service nginx reload

# Creating test file
touch "$root/index.php"
echo "$domain is working!!!" > "$root/index.php"

# SSL
certbot -d $domain

After uploading script to server you need set rules:
sudo chmod +x domain.sh

Using
./domain.sh example.com