community, wg, arch: add wg, sig subprojects and charter for S390x and ARM

[dhiller]

What this PR does / why we need it:

PR #301 added the wg-TEMPLATE as a starting point for creating working groups.

This PR adds two initial wg-arch working groups:

• wg-arch-s390x
• wg-arch-arm to define chairs and leads on S390x and ARM.

Also it defines subprojects in sig-buildsystem and sig-ci, so that arch wg members can own code.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #

Special notes for your reviewer:

[dhiller]

/hold

PR https://github.com/kubevirt/community/pull/301 was split out of this one, so this needs to be rebased after that one got merged.

FYI @fabiand

[chandramerla]

/lgtm

[kubevirt-bot]

@chandramerla: changing LGTM is restricted to collaborators

In response to [this](https://github.com/kubevirt/community/pull/298#issuecomment-2194081639): >/lgtm Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[kubevirt-bot]

@cfilleke: changing LGTM is restricted to collaborators

In response to [this](https://github.com/kubevirt/community/pull/298#discussion_r1689925234): >/lgtm Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[jean-edouard]

@dhiller is the hold still relevant?

[dhiller]

@dhiller is the hold still relevant?

Thanks for the reminder :) Yeah, I think a rebase is needed here, other than that it should be good to go. @jean-edouard will ping you again after that's done if you're ok with that?

[dhiller]

/unhold

@chandramerla @cfilleke @zhlhahaha I have rebased this PR, PTAL, thanks a lot!

@jean-edouard FYI

[jean-edouard]

/approve /cc @jschintag @cfilleke @vamsikrishna-siddu @chandramerla @zhlhahaha

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jean-edouard

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