feat: Symlink PostgreSQL config files

Symlinks PostgreSQL configuration files (`pg_hba.conf`, `pg_ident.conf`, `postgresql.conf`) from `/etc/postgresql/` into the PGDATA directory (`/var/lib/postgresql/data/`).

This ensures that the configuration files within PGDATA are always managed centrally and point to the correct, actively used configuration. The `force: true` option is added to overwrite any existing files, guaranteeing the symlink is correctly established.

Author: hunleyd

ansible/tasks/setup-postgres.yml

@@ -322,10 +322,12 @@
       when:
         - (is_psql_oriole or is_psql_17)
 
-- name: Remove extraneous configuration files
+- name: Symlink the conf files in PGDATA to the actually-in-use conf files
   ansible.builtin.file:
+    force: true
     path: /var/lib/postgresql/data/{{ conf_item }}
-    state: absent
+    src: /etc/postgresql/{{ conf_item }}
+    state: link
   loop:
     - pg_hba.conf
     - pg_ident.conf