fix cmd

kube/values/base/config.yaml

@@ -186,8 +186,8 @@ outpostConfig: |-
           elif notebook_type == "url" and notebook:
               spawner.default_url = notebook
       if spawner.user_options["option"] in ["repo2docker", "custom"]:
-          # spawner.cmd = ["/bin/sh", "-c"]
           spawner.cmd = [
+              "bash", "-c",
               '''
               # Get the current jupyterhub-singleuser version
               version=$(jupyterhub-singleuser --version || echo "0.0.0")