initdb with ignore hidden option

Hi Postgres team,

Our organization would like to make a feature request to ignore hidden files/directories when running an initdb. We use hidden directories for misc backup strategies, and it's cumbersome when needing to coordinate with our storage administrator when we are re-using an existing directory for an initdb.

Options such as these would be helpful:
-ignore-existing
-ignore-dot-files
-ignore=(file/directory name)

Thanks
MF

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