Consider adding `when` to `azapi_update_resource` resource

[0x4c6565]

It would be great to be able to control when resources are updated (either during apply or destroy), like with azapi_resource_action. This would allow for scenarios such as reverting changes to resources. At the moment, i'm having to utilise null_resource with command provisioners to achieve this (horrible).

If there is appetite for adding this, I will raise a pull request to add this functionality

[ms-henglu]

Hi @0x4c6565 ,

Thank you for taking time to report this issue.

Would you please elaborate the use case? I thought this could be achieved with azapi_resource_action with when=destroy?

[0x4c6565]

My particular use case is to revert changes made in a separate azapi_update_resource resource. Without this, the only way to achieve reverting is to create another azapi_update_resource resource to undo the changes with a negated condition, and have that as an active resource in the state. Being able to control when the apply/action takes place would allow two resources to be created - one for applying the change, and the other reverting the change on destroy