Create managed disk from platform image

create-managed-disk.json

{
    "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "diskName": {
            "type": "string"
        },
        "imageUri": {
            "type": "string"
        },
        "storageAccountType" : {
            "type": "string",
            "defaultValue": "Premium_LRS"
        }
    },
    "variables": {
        "location": "[resourceGroup().location]",
        "computeResouresApiVersion" : "2016-04-30-preview"
    },
    "resources": [
      { 
        "apiVersion": "[variables('computeResouresApiVersion')]",
        "type": "Microsoft.Compute/disks",
        "name": "[parameters('diskName')]",
        "location": "[variables('location')]",
        "properties": 
        { 
            "creationData": 
            {
                "createOption": "FromImage", 
                "imageReference": { 
                    "id": "[parameters('imageUri')]"  
                 }
            },
            "accountType": "[parameters('storageAccountType')]"
        }
      }
    ]
}