[Feature Request]: Enable geo-replication for Redis cache.

[Meertman]

Description

A Redis cache supports the setup of geo-replication via bicep through the use of the linked server bicep resource: https://learn.microsoft.com/en-us/azure/templates/microsoft.cache/redis/linkedservers?pivots=deployment-language-bicep

Adding this to the bicep module for deployment of a Redis cache would be a welcome addition.

However the usage of the linked server and a private endpoint proves to be a bit difficult as you cannot add a private link to a Redis cache that is geo-replicated. You first need to remove the geo-replication, then add the link and then re-enable the geo-replication. As documented here: https://learn.microsoft.com/en-us/azure/azure-cache-for-redis/cache-how-to-geo-replication

Specifically:

Private links can't be added to caches that are already geo-replicated. To add a private link to a geo-replicated cache: 1. Unlink the geo-replication. 2. Add a Private Link. 3. Last, relink the geo-replication.

[Meertman]

I've tried to provide some kind of start of an implementation here: Azure/ResourceModules@main...Meertman:ResourceModules:main

But it is far from complete.

[microsoft-github-policy-service]

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[AlexanderSehr]

Hey @hundredacres,
I just migrated this issue over from CARML. Please take a look and triage if still relevant :)

[microsoft-github-policy-service]

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Tagging the AVM Core Team (@Azure/avm-core-team-technical-bicep) due to a module owner or contributor having not responded to this issue within 3 business days. The AVM Core Team will attempt to contact the module owners/contributors directly.

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[hundredacres]

Working on some tests to validate this functionality.

[hundredacres]

PR here: #2562

[Meertman]

@hundredacres, does this also work with private endpoints enabled? In the past I ran into issues with this? (and even created a GitHub issue on bicep for this: Azure/bicep-types-az#1937)