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Auto merge of #12853 - weihanglo:cname-warning, r=ehuss
ci: big⚠️ to ensure the CNAME file is always there ### What does this PR try to resolve? A request from <https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra/topic/doc.2Ecrates.2Eio.20CNAME.20missing> The CNAME file is for GitHub to redirect requests to the custom domain. Missing this may entail security hazard and domain takeover. See <https://docs.github.com/en/pages/configuring-a-custom-domain-for-your-github-pages-site/managing-a-custom-domain-for-your-github-pages-site#securing-your-custom-domain>
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