azurerm_kubernetes_cluster_default_node_pool_invalid_vm_size uses outdated list for VM's

[fheinonen]

tflint fails to validate kubernetes cluster with the following error, when validating HCL. It seems that it is using a list that is not maintained
Error: "Standard_D8s_v4" is an invalid value as vm_size (azurerm_kubernetes_cluster_default_node_pool_invalid_vm_size)

https://github.com/terraform-linters/tflint-ruleset-azurerm/blob/v0.17.1/docs/rules/azurerm_kubernetes_cluster_default_node_pool_invalid_vm_size.md
https://github.com/Azure/azure-rest-api-specs/blob/25fc6633c6feecfc01fd46f4926947f31d2e5945/specification/containerservice/resource-manager/Microsoft.ContainerService/preview/2022-03-02-preview/managedClusters.json#L2690

[wata727]

Good catch. You can change the rule to use the validMachineSizes.
https://github.com/terraform-linters/tflint-ruleset-azurerm/blob/v0.17.1/rules/utils.go

Example: #179