imagePullSecrets not in helm chart templates

imagePullSecrets is present on the values.yaml, but isn't in the deployment template of the [helm chart on artifactHub](https://artifacthub.io/packages/helm/cloudnative-pg/plugin-barman-cloud)

Start by locating the Helm chart's values.yaml and deployment template, then compare how imagePullSecrets is defined and consumed. Verify the chart renders imagePullSecrets in the deployment when configured, and run the chart's available validation or rendering checks.

Written by the indexing model from the issue text.