SSL on Droplet with Wordpress and subdomain with Discourse

I’ve set up the one-click Droplet with Discourse in a subdomain and Wordpress as the default. Attempting to add SSL and I can only get WordPress to run under https. The SSL certificate is a wildcard cert from Namecheap (COMODO).

Before going any further I think I need to get the correct port for SSL on the subdomain.

With the server blocks shown below, https://forum.mydomain.com actually shows https://mydomain.com.

Nginx and Docker/Discourse are new to me, so I could use some help in figuring this out - Thank you!

default:

server {
    listen 80 default_server;
    #listen [::]:80 default_server;

    # Redirect all HTTP requests to HTTPS with a 301 Moved Permanently response.
    return 301 https://$host$request_uri;
}

server {
	listen 443 ssl;

    server_name *.mydomain.com;
    ssl_certificate /etc/nginx/ssl/*.mydomain.com.chained.crt;
    ssl_certificate_key /etc/nginx/ssl/*.mydomain.com.key;
    
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
    ssl_prefer_server_ciphers on;
    ssl_ciphers 'EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH';
      
	root /var/www/html;
	index index.php index.html index.htm;

	location / {
		try_files $uri $uri/ /index.php?q=$uri&$args;
	}

	error_page 404 /404.html;
    	error_page 500 502 503 504 /50x.html;
    	location = /50x.html {
        	root /usr/share/nginx/html;
    	}

    	location ~ \.php$ {
        	try_files $uri =404;
        	fastcgi_split_path_info ^(.+\.php)(/.+)$;
        	fastcgi_pass unix:/var/run/php5-fpm.sock;
        	fastcgi_index index.php;
        	fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        	include fastcgi_params;
    	}
}

forum:

upstream forum {
    server 127.0.0.1:8080 fail_timeout=0;
}

server {
      listen 80;
      server_name forum.mydomain.com;

      root /usr/share/nginx/html;
      index index.html index.htm;

      client_max_body_size 10G;

      location / {
          proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
          proxy_set_header Host $http_host;
          proxy_redirect off;
          proxy_pass http://forum;
      }
}

app.yaml:

...
expose:
  - "8080:80"   # fwd host port 80   to container port 80 (http)
  - "2222:22" # fwd host port 2222 to container port 22 (ssh)
  - "443:443" #  (ssl)
...

By the way, would using two “Let’s Encrypt” certificates work instead of a wildcard certificate (since Let’s Encrypt doesn’t offer wildcards)?