Add permissions docs for Operator containers

Georgi N. Georgiev | GitLabrequested to merge
ggeorgiev/operator-permissions-docs into main

What does this MR do?

Adds docs about permissions for Operator for shared directories.

Why was this MR needed?

What's the best way to test this MR?

What are the relevant issue numbers?

Closes #38671 (closed)

Edited by Georgi N. Georgiev | GitLab

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