Enable oauth on hub api as well

[cedricve]

Pull Request Description

Title: Enable OAuth on Hub API as well

Motivation and Context:

This pull request introduces OAuth2 proxy support to the Hub API and Hub Frontend Demo services. By enabling OAuth2 proxy, we enhance the security of our services by enforcing authentication and ensuring that only authorized users can access them.

Changes:

1. Chart Version Increment:

   • Updated the chart version from 0.61.0 to 0.62.0 in charts/hub/Chart.yaml to reflect the new changes and maintain semantic versioning.

2. Hub API Ingress Annotations:

   • Added conditional annotations for OAuth2 proxy support in charts/hub/templates/kerberos-hub/hub-api.yaml.
   • When kerberoshub.oauth2Proxy.enabled is set to true, the following annotations are added:
     • nginx.ingress.kubernetes.io/auth-url: Points to the OAuth2 authentication URL.
     • nginx.ingress.kubernetes.io/auth-signin: Redirects to the OAuth2 sign-in URL.

3. Hub Frontend Demo Ingress Annotations:

   • Added similar conditional annotations for OAuth2 proxy support in charts/hub/templates/kerberos-hub/hub-frontend-demo.yaml.
   • These annotations ensure that the frontend demo also requires OAuth2 authentication.

Benefits:

• Enhanced Security: By integrating OAuth2 proxy, we add an additional layer of security, ensuring that only authenticated users can access the Hub API and Frontend Demo.
• Consistency: Both the Hub API and Frontend Demo now have consistent authentication mechanisms, improving the overall security posture of our project.

By making these changes, we ensure that our services are more secure and aligned with best practices for authentication and authorization.