Multus v4.0 Chart update

[jdambly-ns]

Summary

This PR introduces significant updates to the Multus Helm chart, improving its functionality, simplifying its setup, and aligning it with Helm 3 best practices. Key changes include updating the chart to support the new multus-thin entry point, automating configuration, and improving the overall chart logic.

Key Changes

1. Thin Entry Point:

   • Updated the chart to utilize the new multus-thin entry point, streamlining the deployment process for this mode.

2. Auto Configuration:

   • Switched to auto configuration, eliminating the need for a ConfigMap. This reduces the complexity of setup and makes the chart easier to manage.

3. CRD Best Practices:

   • Moved the CustomResourceDefinitions (CRDs) into the crds/ directory, adhering to Helm 3 best practices for CRD management.

4. Chart Logic Cleanup:

   • Replaced complex if statements with with blocks to simplify the chart logic, making it more readable and maintainable.
   • Improved support for all Multus command-line arguments, ensuring flexibility and better customization.

5. Command Flag Support:

   • Added full support for configuring all command-line flags for the multus-thin entry point, offering enhanced control over the Multus deployment.

6. Helm Docs Integration:

   • Integrated helm-docs to automatically generate the README.md file from the values.yaml, ensuring that documentation stays up-to-date with the chart’s configurable values.

7. InitContainer for Installation:

   • Moved the Multus installation logic into an initContainer, improving the management of Multus binaries and configuration during startup.

8. CI Integration:

   • Added a GitHub Action workflow for linting and testing the chart. This ensures that the chart is validated against Helm best practices, and any issues are caught during development.

Rationale

• Simplified Setup: Auto configuration and the removal of the ConfigMap simplify deployment, reducing the number of manual steps required.
• Alignment with Best Practices: Moving CRDs and improving logic structure ensures the chart follows Helm 3 guidelines and improves long-term maintainability.
• Better Control and Flexibility: Supporting all command-line flags and switching to multus-thin gives users more control over their Multus configuration.

Testing & Validation

• GitHub Action CI: The included CI workflow automatically lint tests and runs basic validation on each PR or push, ensuring consistency and quality.
• Manual Testing: The updated chart has been manually tested in various Kubernetes environments to validate the changes and confirm proper Multus deployment.

Next Steps

• Future enhancements will include further optimizations and possible additional testing scenarios, but this update lays the foundation for a more streamlined, manageable, and flexible Multus Helm chart.

[jdambly]

@dougbtv I don't have write access to this repo would you be able to give me write access or merge this if you approve of this change?