Get destinationPath from secret

[DevSecNinja]

Hello,

Thanks for this great chart! I'm using the Azure Storage blob backup functionality and need to set the destination path:

https://github.com/cloudnative-pg/charts/blob/3c5dd5d9997592aeb1391b4d11ed2284d68dba31/charts/cluster/values.yaml#L64

Since the destination path is the Azure storage account location, I would like to be able to hide that in a secret. Is that possible? If not, it would be great if that can be added to the chart since the Storage Account name is somewhat sensitive and can provide an attack vector for hackers.

Thank you.