Fixed the tag issue

Author: Prekshith-Microsoft

infra/main.bicep

@@ -177,13 +177,15 @@ var allTags = union(
 resource resourceGroupTags 'Microsoft.Resources/tags@2021-04-01' = {
   name: 'default'
   properties: {
-    tags: {
-      ...resourceGroup().tags
-      ...tags
-      TemplateName: 'Container Migration'
-      Type: enablePrivateNetworking ? 'WAF' : 'Non-WAF'
-      CreatedBy: deployerIdentityName
-    }
+    tags: union(
+      resourceGroup().tags ?? {},
+      tags,
+      {
+        TemplateName: 'Container Migration'
+        Type: enablePrivateNetworking ? 'WAF' : 'Non-WAF'
+        CreatedBy: deployerIdentityName
+      }
+    )
   }
 }
 

infra/main_custom.bicep

@@ -156,13 +156,15 @@ var allTags = union(
 resource resourceGroupTags 'Microsoft.Resources/tags@2021-04-01' = {
   name: 'default'
   properties: {
-    tags: {
-      ...resourceGroup().tags
-      ...tags
-      TemplateName: 'Container Migration'
-      Type: enablePrivateNetworking ? 'WAF' : 'Non-WAF'
-      CreatedBy: createdBy
-    }
+    tags: union(
+      resourceGroup().tags ?? {},
+      tags,
+      {
+        TemplateName: 'Container Migration'
+        Type: enablePrivateNetworking ? 'WAF' : 'Non-WAF'
+        CreatedBy: createdBy
+      }
+    )
   }
 }