add example on how to enable extension on a db

Author: ek9

pillar.example

@@ -131,6 +131,14 @@ postgres:
       lc_ctype: 'en_US.UTF-8'
       lc_collate: 'en_US.UTF-8'
       tablespace: 'my_space'
+      # set custom schema
+      schemas:
+        public:
+          owner: 'localUser'
+      # enable per-db extension
+      extensions:
+        uuid-ossp:
+          schema: 'public'
 
   # optional schemas to enable on database
   schemas: