Update Dockerfile mounting,fix Nginx config typo

nginx/conf.d/ref-test-app.conf

@@ -15,7 +15,7 @@ server {
     listen 443 ssl http2 default_server;
     listen [::]:443 ssl http2 default_server;
 
-	# SSL configuration
+    # SSL configuration
     include	/etc/nginx/ssl.conf;
     include	/etc/nginx/certbot-challenge.conf;