Add policy to deny vnet peering removal

policyDefinitions/Network/vnet-peering-deny-removal/azurepolicy.json

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+{
+  "name": "6f194805-9450-4e29-bd6a-9bc370329126",
+  "type": "Microsoft.Authorization/policyDefinitions",
+  "properties": {
+    "displayName": "Deny VNet peering removal",
+    "description": "This Policy will deny the deletion of VNets peerings with a specified name.",
+    "metadata": {
+      "version": "1.0.0",
+      "category": "Network"
+    },
+    "mode": "All",
+    "parameters": {
+      "effect": {
+        "type": "String",
+        "metadata": {
+          "displayName": "Effect",
+          "description": "DenyAction or Disabled the execution of the Policy"
+        },
+        "allowedValues": [
+          "DenyAction",
+          "Disabled"
+        ],
+        "defaultValue": "DenyAction"
+      },
+      "peeringName": {
+        "type": "String",
+        "metadata": {
+          "displayName": "VNet peering name",
+          "description": "Name of the VNet peering that is not allowed to be removed"
+        },
+        "defaultValue": "Spoke-to-Hub"
+      }
+    },
+    "policyRule": {
+      "if": {
+        "allOf": [
+          {
+            "field": "type",
+            "equals": "Microsoft.Network/virtualNetworks/virtualNetworkPeerings"
+          },
+          {
+            "field": "name",
+            "equals": "[parameters('peeringName')]"
+          }
+        ]
+      },
+      "then": {
+        "effect": "[parameters('effect')]",
+        "details": {
+          "actionNames": [
+            "delete"
+          ]
+        }
+      }
+    }
+  }
+}

policyDefinitions/Network/vnet-peering-deny-removal/azurepolicy.parameters.json

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+{
+  "effect": {
+    "type": "String",
+    "metadata": {
+      "displayName": "Effect",
+      "description": "DenyAction or Disabled the execution of the Policy"
+    },
+    "allowedValues": [
+      "DenyAction",
+      "Disabled"
+    ],
+    "defaultValue": "DenyAction"
+  },
+  "peeringName": {
+    "type": "String",
+    "metadata": {
+      "displayName": "VNet peering name",
+      "description": "Name of the VNet peering that is not allowed to be removed"
+    },
+    "defaultValue": "Spoke-to-Hub"
+  }
+}

policyDefinitions/Network/vnet-peering-deny-removal/azurepolicy.rules.json

@@ -0,0 +1,22 @@
+{
+  "if": {
+    "allOf": [
+      {
+        "field": "type",
+        "equals": "Microsoft.Network/virtualNetworks/virtualNetworkPeerings"
+      },
+      {
+        "field": "name",
+        "equals": "[parameters('peeringName')]"
+      }
+    ]
+  },
+  "then": {
+    "effect": "[parameters('effect')]",
+    "details": {
+      "actionNames": [
+        "delete"
+      ]
+    }
+  }
+}