Install ltree extension in postgres

Hi Colleagues,

I have tried to install ltree extention following link, after deploy still installed_version value is empty. Please guide me on how to install

select * from pg_available_extensions where name='ltree';
name | default_version | installed_version | comment
-------+-----------------+-------------------+-------------------------------------------------
ltree | 1.2 | | data type for hierarchical tree-like structures

I have added my configuration settings as below

users: {}

databases:
  aorsdb: aorsdbuser

preparedDatabases:
  aorsdb:
    extensions:
      ltree: "public"

Start with the preparedDatabases.extensions configuration shown in the issue and reproduce the deployment using the ltree entry. Check the PostgreSQL query for pg_available_extensions afterward; done means installed_version is populated for ltree in the target database.