Add conditional expose directive

[swetha1654]

Issue

The current terraform configuration does not include the option to expose the postgresql application. Since this module is used by hockeypuck charm in the staginge environment, this is a requirement for the hockeypuck terraform files to work. The expose directive needs to be enabled to allow cross model relation between postgresql charm and the hockeypuck charm.

Solution

Add a variable enable_expose that adds expose {} only if it is set to True.

Checklist

• I have added or updated any relevant documentation.
• I have cleaned any remaining cloud resources from my accounts.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.33%. Comparing base (77d8210) to head (7c21a1e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #853   +/-   ##
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  Coverage   72.33%   72.33%           
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  Files          16       16           
  Lines        4045     4045           
  Branches      609      609           
=======================================
  Hits         2926     2926           
  Misses        927      927           
  Partials      192      192           

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[marceloneppel]

Thanks for the contribution, @swetha1654! I tested it locally and it's working fine.