You do not need to use the Bitnami helm charts. If you want to use an already configured database that you have externally, just set internalDatabase.enabled to false, and configure the externalDatabase parameters below.
This does not work, however. When I apply the chart, I still end up with a PostgreSQL instance although I have not deployed it separately.
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The documentation says that:
This does not work, however. When I apply the chart, I still end up with a PostgreSQL instance although I have not deployed it separately.