[confcom] fix Virtual Node bug

Author: MahatiC

src/confcom/azext_confcom/container.py

@@ -823,7 +823,7 @@ def from_json(
         # Start with the customer environment rules
         env_rules = (
             copy.deepcopy(_INJECTED_CUSTOMER_ENV_RULES)
-            if container_json["platform"].startswith("linux") else dict()
+            if container_json["platform"].startswith("linux") else []
         )
         # If is_vn2, add the VN2 environment rules
         if is_vn2:

src/confcom/azext_confcom/security_policy.py

@@ -158,6 +158,10 @@ def __init__(
             container_image.parse_all_parameters_and_variables(self.all_params, self.all_vars)
             container_results.append(container_image)
 
+        # Default platform if no containers were present to set it
+        if self._platform is None:
+            self._platform = "linux/amd64"
+
         self._images = container_results
 
     def __enter__(self) -> Any: