if al2023, then install nftables

[zachdorame]

Issue #, if available: N/A

Description of changes:

For supporting the nftables-based backend beta feature in EKS 1.31 for kube-proxy, we'll need to install ntables into the al2023 image used to build kube-proxy.
This PR is a very tiny change to allow the nftables binary to be installed

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[jaydeokar]

@jaxesn @markapruett
Would like to know your thoughts on this change. This is in for a beta feature that is going in v1.31.0.

https://kubernetes.io/blog/2024/08/13/kubernetes-v1-31-release/#nftables-backend-for-kube-proxy
https://github.com/kubernetes/enhancements/blob/master/keps/sig-network/3866-nftables-proxy/README.md
The requirement is that nftable version be greater than v1.0.1 which is only possible with AL2023 right now

Do you prefer having a new dockerfile or reusing this one as the change is minimal

[jaydeokar]

/ok-to-test

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[jaxesn]

I think this makes sense. Just wanted to confirm tho, the 1.31 kube-proxy image will be based off the al23 base? What is the current kube-proxy image based off?

[zachdorame]

The current kube-proxy is based off the al2 base. However, we have evidence that there's no regressions in switching to al23 base as the al23 base kube-proxy passes our end-to-end tests.

[jaxesn]

Makes sense to me! 🚢

[jaydeokar]

/approve

[markapruett]

/approve

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