Add MSI support also for app service deployment slots

[perbergland]

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Description

#1130 (big thank you!) brought support for enabling MSI for appservices ("SystemAssigned" Identity).

The missing piece is to support this also for deployment slots. According to this thread, this is now supported - in preview like for the primary slot.

New or Affected Resource(s)

• azurerm_app_service_slot

Potential Terraform Configuration

azurerm_app_service_slot {
...
  identity = {
    type = "SystemAssigned"
  }
}

References

• Feature request: MSI support for APP Service #1106
• azurerm_app_service - support for MSI #1130

[perbergland]

Here's how to do it manually using Azure CLI (the fact that you can send in the path of a webapp slot into the webapp command is not documented AFAICT)

az webapp identity assign -n "mainapp/slots/slotname" -g "resourcegroup"
{
  "additionalProperties": {},
  "principalId": "<guid>",
  "tenantId": "<guid>",
  "type": "SystemAssigned"
}

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. If you feel I made an error 🤖 🙉 , please reach out to my human friends 👉 hashibot-feedback@hashicorp.com. Thanks!