Create new k8s client everytime to avoid token refresh issues (#18)

* refresh k8s client

* remove global var

src/acktest/k8s/resource.py

@@ -26,8 +26,6 @@
 
 from ..resources import load_resource_file
 
-_k8s_api_client = None
-
 
 @dataclass
 class CustomResourceReference:
@@ -112,10 +110,10 @@ def load_and_create_resource(resource_directory: Path,
     return reference, spec, resource
 
 def _get_k8s_api_client() -> ApiClient:
-    global _k8s_api_client
-    if _k8s_api_client is None:
-        _k8s_api_client = config.new_client_from_config()
-    return _k8s_api_client
+    # Create new client everytime to avoid token refresh issues
+    # https://github.com/kubernetes-client/python/issues/741
+    # https://github.com/kubernetes-client/python-base/issues/125
+    return config.new_client_from_config()
 
 
 def create_k8s_namespace(namespace_name: str):