deployment script example with no managed identity (#1006)

* deployment script example with no identity

* fix tests

* add readme

* update readme

* fix formatting

docs/examples/101/deployment-script-no-auth/README.md

@@ -0,0 +1,5 @@
+# Deployment Script with no managed identity
+
+As of apiVersion `2020-10-01`, the `identity` is optional. The permissions of the principal creating the template deployment will be used to provision the ACI and/or storage resources that are required for the script to execute.
+
+Note that if a managed identity is not provided, there will be **no preconfigured authentication to Az powershell or Az CLI** in this case. If you need to reach Azure, we recommend adding a managed identity. 

docs/examples/101/deployment-script-no-auth/main.bicep

@@ -0,0 +1,18 @@
+param location string = 'westus'
+param timestamp string = utcNow()
+param dsName string = 'ds${uniqueString(resourceGroup().name)}'
+
+resource script 'Microsoft.Resources/deploymentScripts@2020-10-01' = {
+  kind: 'AzurePowerShell'
+  name: dsName
+  location: location
+  // identity property no longer required
+  properties: {
+    azPowerShellVersion: '3.0'
+    scriptContent: '$DeploymentScriptOutputs["test"] = "test this output"'
+    forceUpdateTag: timestamp // script will run every time
+    retentionInterval: 'PT4H' // deploymentScript resource will delete itself in 4 hours
+  }
+}
+
+output scriptOutput string = script.properties.outputs.test

docs/examples/101/deployment-script-no-auth/main.json

@@ -0,0 +1,40 @@
+{
+  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
+  "contentVersion": "1.0.0.0",
+  "parameters": {
+    "location": {
+      "type": "string",
+      "defaultValue": "westus"
+    },
+    "timestamp": {
+      "type": "string",
+      "defaultValue": "[utcNow()]"
+    },
+    "dsName": {
+      "type": "string",
+      "defaultValue": "[format('ds{0}', uniqueString(resourceGroup().name))]"
+    }
+  },
+  "functions": [],
+  "resources": [
+    {
+      "type": "Microsoft.Resources/deploymentScripts",
+      "apiVersion": "2020-10-01",
+      "kind": "AzurePowerShell",
+      "name": "[parameters('dsName')]",
+      "location": "[parameters('location')]",
+      "properties": {
+        "azPowerShellVersion": "3.0",
+        "scriptContent": "$DeploymentScriptOutputs[\"test\"] = \"test this output\"",
+        "forceUpdateTag": "[parameters('timestamp')]",
+        "retentionInterval": "PT4H"
+      }
+    }
+  ],
+  "outputs": {
+    "scriptOutput": {
+      "type": "string",
+      "value": "[reference(resourceId('Microsoft.Resources/deploymentScripts', parameters('dsName'))).outputs.test]"
+    }
+  }
+}