[cetic/zabbix] Database is not configurable

[scoopex]

Describe the bug

I really welcome the removal of the bitnami postgresql chart because this provides to possibility to simplifies dependencies and provides a better control perspective. Unfortunately the current implementation does not provide the possibility to configure postgresql in detail.
For us the most problematic thing is, that we cannot configure memory/buffer related settings of postgresql with the current implementation. Therefore the current implementation is not ready for production due to the fact that we ran a postgresql instance with several dozens of gigabytes.

Version of Helm and Kubernetes:
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What happened:
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What you expected to happen:

Be capable to configure all postgresql settings.

How to reproduce it (as minimally and precisely as possible):

Use a real world production setup.

Anything else we need to know:
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