Add multiarch build support for etcd

[ArkaSaha30]

This PR will add support for building multiarch etcd as a part of pull-etcd-build presubmit job.

Fixes: etcd-io/etcd#18064

[ivanvc]

This approach slightly differs from what I used to migrate the integration tests. In that case, I took an approach of one matrix target per one prow job, as suggested by @jmhbnz. James, do you have any thoughts on this?

It'd be good to align on this to ensure consistency with other jobs.

/cc @jmhbnz

[jmhbnz]

This approach slightly differs from what I used to migrate the integration tests. In that case, I took an approach of one matrix target per one prow job, as suggested by @jmhbnz. James, do you have any thoughts on this?

It'd be good to align on this to ensure consistency with other jobs.

Hey - I'm happy either way for this one. If we go with a single job the build doesn't take super long even if doing a build-all. If we want to have separate jobs to be consistent with the matrix approach from the github action that is also ok with me. This is something we can easily iterate on if needed.

[jmhbnz]

/approve
/lgtm

Thanks @ArkaSaha30

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ArkaSaha30, jmhbnz

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[k8s-ci-robot]

@ArkaSaha30: Updated the job-config configmap in namespace default at cluster test-infra-trusted using the following files:

• key etcd-presubmits.yaml using file config/jobs/etcd/etcd-presubmits.yaml

In response to this:

This PR will add support for building multiarch etcd as a part of pull-etcd-build presubmit job.

Fixes: etcd-io/etcd#18064

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