Add EL9 support

[bastelfreak]

Summary

Provide a detailed description of all the changes present in this pull request.

Additional Context

Add any additional context about the problem here.

• Root cause and the steps to reproduce. (If applicable)
• Thought process behind the implementation.

Related Issues (if any)

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Checklist

• 🟢 Spec tests.
• 🟢 Acceptance tests.
• Manually verified. (For example puppet apply)

[SimonHoenscheid]

EL9 manages the default postgres in dnf modules, the postgres repo does not.

Recommended way is to disable the postgres dnf modules and install from the postgres repo.

the postgres repo requires a version which is defined via postgresql::globals::version, this is also the default version which is passed to the dnf module via the globals_version variable, which would need a value of 'disabled' here, to act correcty, the globals class requires a patch to make this possible.

My suggestion is to add an optional_parameter like dnf_module_version, unless set real_dnf_module_version defaults to $version/global_version.

https://github.com/puppetlabs/puppetlabs-postgresql/blob/main/manifests/globals.pp#L289

[ekohl]

EL9 manages the default postgres in dnf modules, the postgres repo does not.

For plain EL9 this isn't true:

# dnf install postgresql
...
# dnf module list --enabled -q

You can install PostgreSQL 15 or 16 via modules, but the default (13) is not modular.

The reason the test fails is that it sets manage_dnf_module to true and version to '13'. That isn't a combination that exists.

The easiest fix is to pick a version that exists in both EL 8 & 9 as modular versions, which means picking 15 or 16.

[ekohl]

I'd change the version to 15 or 16. I don't have a RHEL 8 at hand to see if it ships 16 already, so I'd suggest 15.