add option to set ManagedBy field.

[rna-afk]

Adding the option to set the ManagedBy field to
the azure_resource_group resource.

[tombuildsstuff]

hey @rna-afk

Thanks for this PR.

Last time we looked into this, unfortunately the managedBy field couldn't be set by anything other than the Azure control-plane itself - as such this probably doesn't make sense to expose as a user-configurable field in Terraform.

However in the proposed changes this is being exposed as a read-only field (since it's only being set from the API Response), so I'm curious as to the use-case for this field - are you looking to use the value from this field in another resource, or are you looking to manage this field?

Thanks!

[rna-afk]

We are just looking to use this field for some automated system that we have running in the background that just checks the field and installs a few RBAC resources into the resource group if the right value is set. The almost immutable nature of managedby could be useful here.

[stephybun]

Thanks for this PR @rna-afk. Looking into this it appears this field can be set.

In addition to the comments left below we need to add an additional acceptance test for this property and also to update the documentation. Once those points have been resolved we can get this merged. Thanks!

[rna-afk]

Thanks for the suggestions @stephybun . I fixed them and added unit tests.

[stephybun]

Thanks @rna-afk, one more comment and the docs still need to be updated.

[rna-afk]

Thanks @stephybun, added docs.

[jackofallops]

Thanks for this contribution @rna-afk

I've left a few comments below if you can take a look, then we can get this tested.

Thanks!

[stephybun]

Thanks for this @rna-afk LGTM 🌻

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