feat(providers): Add support for array DCS values

[jonasdemoor]

Pull Request (PR) description

This PR adds support for handling array config values (e.g. postgresql.pg_hba). I'm not sure if this is the best way to do it, but it's the only way I found to be working, while still supporting non-array values.

This Pull Request (PR) fixes the following issues

n/a

[bluthg]

I'm quite sure that a simple Patroni reload is sufficient to activate changes in the pg_hba part.

[jonasdemoor]

I'm quite sure that a simple Patroni reload is sufficient to activate changes in the pg_hba part.

Hi, you're correct, I tested this and only the pg_hba changes in the YAML config file are taken into account; the pg_hba changes in DCS are ignored.

pg_hba is listed in the DCS docs though: https://patroni.readthedocs.io/en/latest/dynamic_configuration.html#dynamic-configuration

[bluthg]

Hmmm... TBTH, I was pointed here by @lbetz and only just read what provider/patroni_dcs_config/patronictl.rb actually does 🙈
In my experience, patronictl knows by itself when to propagate what and how. So if it doesn't do so in this case, something else is probably wrong.
Are you positive that you're changing the pg_hba entry of the ^postgresql: part? Not the one in the ^bootstrap: part?

[bastelfreak]

@jonasdemoor can you take another look here?