Add note for MacOS users

[stephen37]

What this PR does / why we need it:
Add note for MacOS users when using Ansible. Due to some security changes made on MacOS, we need to set up a specific environment variable.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer: None

Does this PR introduce a user-facing change?:
NONE

[seldondev]

Hi @stephen37. Thanks for your PR.

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[RafalSkolasinski]

Nice one! Thanks a lot

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RafalSkolasinski

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