Add custom port variable for wordpress (#103)

* add variable for custom public port

* add public_port variable

templates/wordpress/0/docker-compose.yml

@@ -3,7 +3,7 @@ wordpress:
   links:
     - db:mysql
   ports:
-    - 80:80
+    - ${public_port}:80
 
 db:
   image: mariadb

templates/wordpress/0/rancher-compose.yml

@@ -4,7 +4,13 @@
   description: "Blog tool, publishing platform and CMS"
   uuid: Wordpress-0
   minimum_rancher_version: v0.51.0
-  questions:
+  questions:    
+    - variable: public_port
+      description: "public port to access the wordpress site"
+      label: "Public Port"
+      required: true
+      default: "80"
+      type: "int"
 
 
 wordpress: