fix: Add posix in pre-deployment hook in azure.yaml

[chaudhariniraj]

Purpose

Add posix in pre-deployment hook in azure.yaml

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

• ...

Other Information

[Copilot]

Pull request overview

Adds a POSIX (non-Windows) preprovision hook message in azure.yaml so users on macOS/Linux get the same deployment guidance banner that Windows users already see.

Changes:

• Add a posix preprovision hook that prints an ANSI-colored guidance message and issue link.
• Configure the POSIX hook to run under sh with interactive: true.

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