Add s390x Artifacts

[Rurouni-Jiaxin]

What this PR does / why we need it:

I create this PR as part of the bigger effort to enable KubeVirt on s390x, a.k.a IBM Z ( please refer to : https://github.com/kubevirt/kubevirt/pull/10490 ). It appears that https://github.com/kubevirt/common-instancetypes/ depends on containerdisks.

Therefore I added "s390x" entries to existing Feodora, CentOS Stream and Ubuntu Artifact / registries.

I have not added any tests to either artifacts/fedora/fedora_test.go , artifacts/centosstream/centos-stream_test.go, or artifacts/ubuntu/ubuntu_test.go, because the tests appears to only verify the parsing function.

TO DO:

Discuss whether other Linux distros, e.g. OpenSUSE is needed for s390x.

Special notes for your reviewer:

Release note:

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[jcanocan]

@Rurouni-Jiaxin Thanks for your PR! Could you please add a description to your commit and sign it off?

[Rurouni-Jiaxin]

Hi! Thanks for your contribution!

You are right that the unit tests are mainly focused on parsing data returned from the mirrors. Nonetheless, can you please add unit tests for s390x in the artifacts you touched? (fedora, centosstream and ubuntu). Opensuse does not ship cloud images for s390x, so it is okay to leave it out.

Are you going to add s390x preferences to common-instancetypes soon? Otherwise I would like to ask you to remove the instancetypes/preferences from the images env variables for now.

We don't have automated testing for aarch64 artifacts yet but we're looking to add that in the future. Would you be able to provide resources to automate the testing of s390x artifacts?

Last question: Did you verify the newly created containerdisks are able to boot in your local environment?

Regarding s390x resources, I assume by looking at the nodeSelector in these ProwJobs, that bare metal servers are required. Such resources would be available on s390x, but it will take time.

[kubevirt-bot]

Thanks for your pull request. Before we can look at it, you'll need to add a 'DCO signoff' to your commits.

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The list of commits missing DCO signoff:

• 95a04a5 Add s390x Artifacts

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[Rurouni-Jiaxin]

Still testing on my local s390x environment

[Rurouni-Jiaxin]

/hold

[kubevirt-bot]

PR needs rebase.

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[lyarwood]

Closing as https://github.com/kubevirt/containerdisks/pull/203 has now landed introducing centos stream and ubuntu artefacts, please feel to rebase and reopen if you want to use this PR to add more.