[stable/cachet] DB_DRIVER defined twice

[fcecagno]

Description

DB_DRIVER is being defined twice in the configmap, which makes helm fail with:

Helm upgrade failed: error while running post render on files: map[string]interface {}(nil): yaml: unmarshal errors:
  line 28: mapping key "DB_DRIVER" already defined at line 19

Removed one of the properties and left the env.public.DB_DRIVER, which had the correct default value pgsql.

Version 1.3.3 only works if env.public.DB_DRIVER is defined as empty, so it's ignored and not set in the configmap.

Checklist

• Title of the PR starts with chart name (e.g. [stable/mychartname])
• I have read the contribution instructions, bumped chart version and regenerated the docs
• Github actions are passing

[max-rocket-internet]

Cool, thanks @fcecagno 💗