Remove postgres_on_cluster option

You should set postgres_on_cluster for the host/globally as needed

tasks/main.yml

@@ -31,7 +31,6 @@
       name: "{{ matrix_authentication_service_pg_user }}"
       password: "{{ matrix_authentication_service_pg_password }}"
     db_name: "{{ matrix_authentication_service_pg_database }}"
-    postgres_on_cluster: true
   when: "matrix_authentication_service_pg_create_database"
 
 - name: Copy config file