feat: Add support for Flatcar Container Linux

[johananl]

This PR adds support for Flatcar Container Linux.

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[k8s-ci-robot]

Hi @johananl. Thanks for your PR.

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[hakman]

/ok-to-test

[hakman]

/retest

[hakman]

Thanks @johananl! 🙂
@SergeyKanzhelev this looks pretty safe to merge ahead of 1.34.
/lgtm

[SergeyKanzhelev]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hakman, johananl, SergeyKanzhelev

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[johananl]

Thanks guys for the quick review! 🙏