PR-2

This Merge Request is associated with A GitHub PR

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Created by: SemiCicada

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Added

• Added the ability to reference Kubernetes secrets in place of the OIDC client_secret value by using client_secret_ref under templates/secret.yaml.
• Added Role and RoleBinding for the Authservice service account to access secrets in the release namespace under templates/rbac.yaml.
• Added corresponding example chains.full.client_secret_ref entry in chart/values.yaml.