create tasks for cron extension

roles/common/tasks/postgres_cron.yml

@@ -49,17 +49,17 @@
     name: postgresql
     state: started
 
-- name: "Configure pg_cron extension"
+- name: "Create cron extension {{ timescaledb_database_name }}"
   tags:
     - install
     - timescaledb_install
-  postgresql_query:
+  postgresql_ext:
+    name: pg_cron
     db: "{{ timescaledb_database_name }}"
-    login_user: "{{ postgres }}"
+    state: present
+    login_user: "postgres"
     login_password: "{{ postgresql_admin_password }}"
     login_host: "{{ lxc_ip }}"
-    query:
-      - CREATE EXTENSION pg_cron;
 
 - name: "Restart postgresql service"
   tags: