Added get_domain function

roles/docker-wordpress/tasks/install.yml

@@ -2,7 +2,7 @@
   command: >
     docker-compose exec -T -u www-data application
     wp core install
-      --url="{{ web_protocol }}://{{ domains[application_id][0] }}"
+      --url="{{ web_protocol }}://{{ domains | get_domain(application_id)[0] }}"
       --title="{{ applications[application_id].title }}"
       --admin_user="{{ applications[application_id].users.administrator.username }}"
       --admin_password="{{ applications[application_id].credentials.administrator_password }}"

roles/docker-wordpress/tasks/plugins/wp-discourse.yml

@@ -5,7 +5,7 @@
 
 - name: Wait for Discourse API
   wait_for:
-    host: "{{ domains.discourse }}"
+    host: "{{ domains | get_domain('discourse') }}"
     port: 80
     delay: 5
     timeout: 600