`postgresql.auth.password` defaulting to null causes errors in some cases on helm 3.17.1

[techno-tanoC]

Hello,

The default value of postgresql.auth.password in values.yaml is set to null, which can lead to errors in certain situations.

Error: values don't meet the specifications of the schema(s) in the following chart(s):
postgresql:
- postgresqlPassword: Invalid type. Expected: string, given: null

The postgresql.auth.password field is unnecessary when postgresql.existingSecret is specified, but it is still required.

contrib-helm-chart/charts/redash/values.yaml

Lines 595 to 596 in 8b08dab

	# postgresql.auth.password -- REQUIRED: PostgreSQL password for redash user (when postgresql chart enabled)
	password:

This issue arises due to changes introduced in Helm 3.17.1 ( helm/helm#12879 ).

Please consider setting a default string for postgresql.auth.password to prevent such errors.