Update kestrel/.gitlab-ci.yml file

kestrel/.gitlab-ci.yml

@@ -9,6 +9,7 @@ install_kestrel:
   image: python:slim-buster
   script:
     - pip install kestrel-jupyter
+    - python -m kestrel_jupyter_kernel.setup
     - kestrel_jupyter_setup
   cache:
     key: "$CI_COMMIT_REF_SLUG-pip"