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Looks like it might not be doable: <https://stackoverflow.com/questions/70167839/how-to-create-a-host-key-in-function-app-through-pulumi>
The referenced issue is still open: <https://github.com/Azure/azure-rest-api-specs/issues/13424>

I suspect you could use the SDK to create the host key, after creating everything else using Pulumi