Add chainguard to list of OSs

[max-allan-cgr]

Please can we add chainguard to the list of OSs?
Our os-release is debian format:

/ # cat /etc/os-release 
ID=chainguard
NAME="Chainguard"
PRETTY_NAME="Chainguard"
VERSION_ID="20230214"
HOME_URL="https://chainguard.dev/"

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: max-allan-cgr / name: Max Allan (14aa2fc)

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[kubernetes-prow]

Hi @max-allan-cgr. Thanks for your PR.

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[jarias-lfx]

/easycla

[wangzhen127]

/lgtm

[kubernetes-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: max-allan-cgr, wangzhen127

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[kubernetes-prow]

@max-allan-cgr: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-npd-e2e-test	14aa2fc	link	true	/test pull-npd-e2e-test
pull-npd-test	14aa2fc	link	true	/test pull-npd-test

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.