Fixing env variable override issue

Author: kumar-shivam-ranjan

ads/aqua/modeldeployment/deployment.py

@@ -521,9 +521,9 @@ def _create(
         if params:
             env_var.update({"PARAMS": params})
         env_vars = container_spec.env_vars if container_spec else []
+        env_vars = [{k: v} for env in env_vars for k, v in env.items() if v]
         for env in env_vars:
             if isinstance(env, dict):
-                env = {k: v for k, v in env.items() if v}
                 for key, _ in env.items():
                     if key not in env_var:
                         env_var.update(env)