feat: resource group dependencies

[kewalaka]

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Description

Consider the scenario where the module is used to create resource group, with the intention these are used by components such as umi's and vnets.

This can be almost be accomplished by setting the resource_group_creation_enabled flag and passing in the name of the RG, except there is no dependency in place between these resources and the RG module, and thus it can fail.

Q. Is this approach valid, are we at risk of introducing unnecessary dependencies?

Describe the solution you'd like

Proposal is to add dependencies on the RG module. It would also be good to add the RGs to the outputs so components external to the module can make use of them.

Currently I create the resource groups outside the LZ module.

Additional context

[matt-FFFFFF]

Hi @kewalaka

At the moment the submodule create their own RGs, e.g. vnet/umi.

Is there another scenario that you would like?

[kewalaka]

@matt-FFFFFF just illustrated what i'm looking to accomplish with PR #371

[kewalaka]

hi @matt-FFFFFF - i didn't directly answer your question but it is in the PR linked above, namely the scenario is to have a single RG for LZ resources such as the vnet/umi rather than a separate one for each. Especially when doing "resource group vending" - having so many small-scoped RGs becomes a bit overwhelming.

The use case is illustrated on https://github.com/Azure/terraform-azurerm-lz-vending/pull/371

Unless i'm missing something this looks like a reasonable non-contentious one to land (famous last words 😅)