EL config: a 'become_user' is missing.

tasks/postgresql-config-el.yml

@@ -121,6 +121,8 @@
       notify: Restart postgresql
 
     - name: postgresql-config-el | We want postgres listen on the public IP
+      become: true
+      become_user: postgres
       community.postgresql.postgresql_set:
         name: 'listen_addresses'
         value: "{% if psql_listen_on_ext_int %}*{% else %}default{% endif %}"