Regression: missing envvars in nginx.conf template.

.templates/nginx/nginx.conf

@@ -23,7 +23,7 @@ server {
 
     # Let's Encrypt (acme.sh) support.
     location ~ ^(/\.well-known/(?!(caldav|carddav|nodeinfo|webfinger)).*$) {
-        proxy_pass http://localhost:8100;
+        proxy_pass http://$PAR_ACMEHOST:$PAR_ACMEPORT;
         error_page 500 502 503 504 @proxy_error;
     }