Multi-architecture build of e2e and plumbing images

[vdemeester]

In order to support multiple architecture, we need to provide image in multiple
architecture for the projects's end-to-end tests. This also applies to some images built
in plumbing as we may use them on the target clusters (s390x, arm64, …) and/or during
end-to-end tests.

In an ideal world, we would use tekton to build those (aka dogfooding, …). My initial
search around this mainly ended up around qemu, qemu-user-static and docker (+buildkit).

See

• crazy-max/ghaction-docker-buildx: GitHub Action to set up Docker Buildx
• hello-multiarch/image.yml at master · piwi3910/hello-multiarch

So the questions is how should we proceed:

• Have a quick way of building multi-arch images using github action (as above)
• Have a "middle" solution where we use dogfooding with some DinD, privileged containers
  and buildx
• Find some way to replicate the github action flow in tekton (ideally without any need to
  privileged containers, but I have high doubt that it's possible)

/cc @afrittoli
/kind feature

[barthy1]

Can first versions of the mentioned images be built using the fastest way? I guess it would be github actions. Just to unblock "other arch support" activities..
And some longer but more conceptual approach can be used after.

[vdemeester]

@barthy1 yeah, @afrittoli said the same during our productivity working group 👼

[barthy1]

@vdemeester I'd like to suggest the first candidate for multi-arch build here is gcr.io/tekton-nightly/github.com/tektoncd/pipeline/build-base:latest, as it's used in .ko.yaml for pipeline, and required to be mluti-arch to use --platform=all option. At this moment it is built by gcr.io/kaniko-project/executor:v0.17.1, which doesn't support multi-arch manifest.
Do you think it makes sense to have the workflow to run Github actions build in plumbing or better in pipeline?

[barthy1]

One more idea, for future extensions. We can use Tekton task to start Github action - https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows#workflow_dispatch :)

[chmouel]

Is there any cloud provider we could have access to ? (IBM, Google or others), where we can just spin up a VM there, inject our build script from a tekton task and get back the multi arch build ?

I understand that Github may seem easy to implement but I think we have the opportunity to show that tekton can be the right CI tool for this kind of workflow and not having to leverage another CI provider for it.

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