Consider moving docker buildx -> ko

[jayanthvn]

What would you like to be added:
Multi-arch image build uses docker buildx and that takes a lot of time. One example - https://github.com/aws/amazon-vpc-cni-k8s/actions/runs/4119775035/jobs/7113817570 , it took 40+ mins and some times more than an hour or so.

AWS LB cntrl moved away from buildx to ko and saw improvements from 2 hrs to 15 mins, we need to evaluate if that would benefit with faster builds for multi-arch images - kubernetes-sigs/aws-load-balancer-controller#2955

Why is this needed:
Faster builds during PR merges. Maybe not urgent but something to POC.

[jdn5126]

I can try this out. I think we should also remove the go mod download calls as they do not help much with layer caching and add a significant amount of time pulling unnecessary modules and their dependencies.

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 14 days

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 14 days

[jayanthvn]

/not stale

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 14 days

[jchen6585]

This seems unviable based on what I have seen today. Today we build multiple binaries into a single image as seen in our Dockerfile.release file. This contradicts this statement right here. This github issue in the Ko repo also hints that this is unviable as of now. I took a look at the repo tagged in this issue and also the VPC-RC repo, and see that they are using Ko to build an image with a single binary which is based off of the main.go file in the root directory. Please correct me if I am wrong. Thanks!

[jdn5126]

Thanks for digging into this @jchen6585! From the ko documentation and that issue, I agree with your conclusion. I think we can close this issue as one that we explored, but concluded as not currently feasible.

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