Fix IPv6 Compatibility for Backend

[chaturvedi-kna]

Description

This pull request addresses the issue [#3556] (#3556) by fixing two critical IPv6 compatibility problems in the ODH Dashboard backend:

1. Dynamic IP Binding for Server:

   • Updated the backend server to dynamically detect and bind to an appropriate IP address.
   • The server now binds to :: by default, supporting IPv4, IPv6, and dual-stack environments.
   • Code changes were made in src/utils/constants.ts to handle dynamic IP detection.

2. Proper Handling of IPv6 Hostnames in API Calls:

   • Fixed the API hostname validation issue where IPv6 addresses were not properly enclosed in square brackets ([]).
   • This resolves the Hostname/IP does not match certificate's altnames error observed in IPv6-only environments.
   • Code changes were made in src/plugins/kube.ts.

Why?

• The changes are critical to ensure the dashboard operates in IPv6-only and dual-stack environments without errors.
• These fixes also enhance compatibility for modern networking setups.

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How Has This Been Tested?

The changes were tested in the following scenarios using ODH Operator version 2.13.1 on OpenShift 4.16:

1. IPv6-Only Environment:
   • Verified that the backend successfully binds to ::.
   • Confirmed the resolution of hostname validation errors in API calls.

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Test Impact

• Manual validation in IPv6 environment ensures fix.

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Request Review Criteria

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work.
• Testing instructions have been added in the PR body.
• The developer has added tests or explained why testing cannot be added (unit and API tests for backend changes).

If you have UI changes:

• [n/a] No UI changes were made.

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Testing Instructions

To test these changes:

1. Deploy the dashboard backend using the custom PR image built for this branch.
2. Test in IPv4, IPv6-only, and dual-stack environments:
   • IPv4: Confirm the server binds to 0.0.0.0.
   • IPv6: Confirm the server binds to :: and resolves API calls correctly.
   • Dual-Stack: Verify compatibility with both protocols.
3. Validate the liveness and readiness probes:
   kubectl/oc get events -n

[openshift-ci]

Hi @chaturvedi-kna. Thanks for your PR.

I'm waiting for a opendatahub-io member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[lucferbux]

/ok-to-test

[chaturvedi-kna]

I am updating this PR to sync with master

[openshift-ci]

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