feat: allow vpcTag to be specified to override tag

[6ixfalls]

Pull Request

• Make sure you have followed Kube-OVN Code Style.

What type of this PR

Examples of user facing changes:

• Features

Allows the tag for the vpcRepository image (vpc-nat-gateway) to be overriden. Useful when the image tags are using digest references, since the tag for the kubeovn image can't be reused for vpc-nat-gateway.

[gemini-code-assist]

Summary of Changes

Hello @6ixfalls, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the Helm charts for Kube-OVN by providing a dedicated configuration option to specify the image tag for the vpc-nat-gateway component. This change addresses scenarios where the vpc-nat-gateway image might require a different tag than the main kubeovn image, such as when using digest references, thereby increasing flexibility in image management and deployment.

Highlights

• New Configuration Option: Introduced a new vpcTag parameter within the global.images.kubeovn section of the values.yaml files for both kube-ovn and kube-ovn-v2 Helm charts. This allows explicit control over the vpc-nat-gateway image tag.
• Image Tag Resolution Logic: Modified the vpc-nat-config.yaml templates to prioritize the newly introduced vpcTag for the vpc-nat-gateway image. If vpcTag is not specified (or empty), it gracefully falls back to using the general tag value defined for kubeovn.
• Documentation Update: The README.md for kube-ovn-v2 has been updated to include the vpcTag in the image configuration example, improving clarity for users regarding this new option.

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[gemini-code-assist]

Code Review

This pull request introduces a new vpcTag value to allow overriding the image tag for the vpc-nat-gateway, which is useful for digest-based image references. The implementation is correct, using the Helm or function as a fallback to the existing tag value across both kube-ovn and kube-ovn-v2 charts. The associated documentation and default values have also been updated accordingly. I've noted one minor issue regarding an unrelated documentation change that should ideally be in a separate PR to keep the history clean.

[gemini-code-assist]

This documentation change for networking.skipConntrackDstCidrs seems unrelated to the main purpose of this pull request, which is to allow specifying vpcTag. To maintain a clean and focused commit history, it's generally better to submit unrelated changes in separate pull requests. Please consider moving this change to a separate PR.

[6ixfalls]

I ran helm-docs to regenerate the chart README - that wasn't added from a prior commit by someone else.