Fixing issue with package notebook in jupyterhub image.

 - Refactoring of code so it can build and install directly the authentication package
    instead of getting it from github.
 - Installing notebook as a separate dependency
 - Letting pip install the jupyterhub version according to the notebook package.

modules/jupyter/authentication/Dockerfile

@@ -0,0 +1,9 @@
+FROM jupyterhub/k8s-hub:3.3.8
+
+ADD ./authenticator/ ./authenticator
+
+USER root
+RUN chmod -R u+w ./authenticator
+
+RUN pip3 install notebook
+RUN pip3 install ./authenticator

modules/jupyter/authentication/authenticator/setup.py

@@ -23,10 +23,10 @@
     long_description="long description here",
     long_description_content_type="text/markdown",
     url="https://github.com/chiayi/ai-on-gke/tree/main/ray-on-gke/user/jupyterhub/auth",
-    packages=['gcpiapjwtauthenticator'],
+    packages=setuptools.find_packages(),
     license='Apache 2.0',
     install_requires=[
-        "jupyterhub>=4.1.0",
+        "jupyterhub",
         "tornado>=6.3.3",
         'oauthenticator>=0.9.0',
         'pyjwt>=2.7.0',