Do not enable the postgresql@12-main service

We want it to run only once the encrypted data directory has been
mounted

site-cookbooks/kosmos-postgresql/recipes/replica.rb

@@ -33,7 +33,6 @@ end
 
 service postgresql_service do
   supports restart: true, status: true, reload: true
-  action [:enable]
 end
 
 postgresql_data_bag_item = data_bag_item('credentials', 'postgresql')