Document resource_group_tags parameter for Azure runbook

docs/run_test/platform.rst

@@ -192,6 +192,10 @@ deployment.
          use_ipv6: "<true or false>"
          enable_vm_nat: "<true or false>"
          source_address_prefixes: $(source_address_prefixes)
+         resource_group_tags:
+            Environment: Testing
+            Project: LISA
+            Owner: YourName
       requirement:
          ...
          ignored_capability:
@@ -266,6 +270,30 @@ deployment.
 
      # List format
      lisa -r ./microsoft/runbook/azure.yml -v "source_address_prefixes:['192.168.1.0/24','10.0.0.0/8']"
+* **resource_group_tags**. Specify tags to apply to resource groups created by LISA
+  as key-value pairs. Tags help organize and categorize Azure resources for tracking,
+  cost management, and governance. If not provided, no tags will be applied to the
+  resource groups.
+
+  Azure tag naming conventions:
+
+  - Tag names are case-insensitive
+  - Maximum key length: 512 characters
+  - Maximum value length: 256 characters
+  - Maximum 50 tags per resource group
+  - Allowed characters: alphanumerics, spaces, and ``+ - = . _ : / @``
+
+  Example:
+
+  .. code:: yaml
+
+     azure:
+       resource_group_tags:
+         Environment: Testing
+         Project: LISA
+         CostCenter: Engineering
+         Owner: TeamName
+
 * **ignored_capability**. Specify feature names which will be ignored in
   test requirement. You can find the feature name from its name method in source code.
   For example, IsolatedResource feature's name defined in ``lisa/features/isolated_resource.py`` as below:

docs/run_test/runbook.rst

@@ -128,6 +128,7 @@ Below section is for running cases on Azure platform, it specifies:
 -  admin_private_key_file: the private key file to access the Azure VM. (Optional)
 -  subscription_id: Azure VM is created under this subscription.
 -  azcopy_path: the installation path of the AzCopy tool on the machine where LISA is installed. It speeds up copying VHDs between Azure storage accounts. (Optional)
+-  resource_group_tags: tags to apply to created resource groups as key-value pairs. (Optional)
 
 .. code:: yaml
 
@@ -137,6 +138,9 @@ Below section is for running cases on Azure platform, it specifies:
        azure:
          subscription_id: $(subscription_id)
          azcopy_path: $(azcopy_path)
+         resource_group_tags:
+           Environment: Testing
+           Project: LISA
 
 Select and set test cases
 ~~~~~~~~~~~~~~~~~~~~~~~~~

lisa/microsoft/runbook/azure.yml

@@ -51,6 +51,12 @@ variable:
     value: true
   - name: create_public_address
     value: true
+  - name: resource_group_tags
+    value: ""
+    # Example usage:
+    # resource_group_tags:
+    #   Environment: Testing
+    #   Project: LISA
 concurrency: $(concurrency)
 notifier:
   - type: html
@@ -76,6 +82,7 @@ platform:
       subnet_prefix: $(subnet_prefix)
       use_public_address: $(use_public_address)
       create_public_address: $(create_public_address)
+      resource_group_tags: $(resource_group_tags)
     requirement:
       core_count:
         min: 2