Add cross-MRG Discovery deployment support

[Mukesh Dua (mukesh-dua)]

PR Checklist

Contribution Guide

Best Practice Guide

• I have read and followed the Contribution Guide and best practices checklist.

Changelog

• Add an optional cross-MRG region parameter for Discovery supporting dataplane resources.
• Deploy the virtual network, managed identity, and storage account in the override region while keeping Discovery resources in the primary region.
• Pass the override region to the Supercomputer and Workspace through the discovery.overridemrgregion tag.
• Synchronize the sample parameters and document cross-MRG deployment.
• Record the successful Azure deployment in metadata.json.

Validation

• az bicep build passed.
• ARM preflight validation passed.
• What-if completed with 15 creates, 0 modifications, and 0 deletions.
• Deployment succeeded in resource group mduabicep0922026.
• Discovery resources were verified in UK South.
• The virtual network, managed identity, and storage account were verified in Sweden Central.

Deployment evidence

• Deployment name: discovery-crossmrg-20260922-1732
• Correlation ID: 19f1d98f-5cf3-425b-a8b3-38fb75c30715

[Alex Frankel (alex-frankel)]

/validate

[Mukesh Dua (mukesh-dua)]

/validate