Updated cicd-keyvault.md to add section on RBAC

[kelmansoury]

Add section on assigning the required permissions for code signing when using role-based access control.

[learn-build-service-prod[bot]]

Learn Build status updates of commit 0b2e2a0:

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[kelmansoury]

@microsoft-github-policy-service agree

[learn-build-service-prod[bot]]

Learn Build status updates of commit cb8b0b4:

:white_check_mark: Validation status: passed

File	Status	Preview URL	Details
msix-src/desktop/cicd-keyvault.md	:white_check_mark:Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel