versionned packages in vars

[EmptyByte]

Nice role! Should replace the official RHEL system_role for PostgreSQL imo (have a look at it).

For packages vars I would suggest :

__postgresql_packages: >-
  {{
    ['@postgresql:' ~ postgresql_version ~ '/server', 'postgresql-contrib'] 
    if postgresql_version != '13' 
    else ['postgresql-server', 'postgresql-contrib']
  }}

and then you can define postgresql_version in defaults but this means validating if each version exists

[EmptyByte]

distribution_postgresql_support_map:
  redhat8: [10, 12, 13, 15, 16]
  redhat9: [13, 15, 16]

- name: Check if PostgreSQL version is supported on distribution
  ansible.builtin.assert:
    that: postgresql_version | int in distribution_postgresql_support_map[ansible_facts['distribution'] | lower + ansible_facts['distribution_major_version']]
    success_msg: "PostgreSQL version {{ postgresql_version }} is supported on {{ ansible_facts['distribution'] | lower }} {{ ansible_facts['distribution_major_version'] }}"
    fail_msg: "PostgreSQL version {{ postgresql_version }} is not supported on {{ ansible_facts['distribution'] | lower }} {{ ansible_facts['distribution_major_version'] }}"
    quiet: false

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