Support Updates in azurerm_container_app_custom_domain

[michael-sterling]

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Description

Updating the container_app_environment_certificate_id property on the azurerm_container_app_custom_domain resource should not require deleting and re-creating the custom domain.

Currently, because container_app_environment_certificate_id is marked ForceNew¹, updating that property in Terraform causes the provider to delete and re-create the entire custom domain for the Container App. This results in downtime for the domain after it is deleted but before it is re-created.

However, this is not necessary; updating the Certificate ID for a Custom Domain using the Azure REST API directly does not cause downtime.

Likely this property was marked ForceNew because the resource currently has no Update() method, and marks all properties ForceNew to use Delete() and Create() to "simulate" an update. The current implementation of Delete()² should be a reasonable template to implement Update-in-place logic.

New or Affected Resource(s)/Data Source(s)

azurerm_container_app_custom_domain

Potential Terraform Configuration

No response

References

Footnotes

1. container_app_environment_certificate_id is marked as ForceNew: true, here ↩

2. Current Delete implementation updating just one Custom Domain in a Container App ↩