add acmetool handling to nginx config

request-tracker/defaults/main.yml

+---
+rt_enable_acmetool: False

request-tracker/templates/nginx-rt.j2

@@ -39,10 +39,24 @@ server {
 		fastcgi_param  SERVER_NAME        $server_name;
 		fastcgi_pass unix:///var/run/rt4-fcgi.sock;
 	}
+	{% if rt_enable_acmetool %}
+	location /.well-known/acme-challenge {
+		alias /var/lib/acme/webroot;
+		try_files $uri =404;
+	}
+	{% endif %}
 }
 
 server {
 	listen 80;
 	server_name {{rt_webdomain}};
+	{% if rt_enable_acmetool %}
+	location /.well-known/acme-challenge {
+		alias /var/lib/acme/webroot;
+		try_files $uri =404;
+	}
+	{% endif %}
+	location / {
 		return 301 https://$server_name$request_uri;
 	}
+}