fix(nginx): noindex preview hostnames at the edge#2569
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Preview hostnames proxy SDK/Client/CLI paths straight to apify.github.io, so they serve production content even after the apify-docs preview S3 bucket is cleaned up. A `site:preview.docs.apify.com` search currently returns dozens of these URLs. Add a server-level `X-Robots-Tag` header so every response under a preview hostname -- including upstream proxies, error pages, and future routes -- tells search engines not to index, follow, or archive it.
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Adds a server-level
X-Robots-Tag: noindex, nofollow, noarchiveheader to the preview hostname server block (*.preview.docs.apify.com) so search engines stop indexing preview URLs — including the SDK/Client/CLI paths thatproxy_passtoapify.github.ioand have no preview bucket to clean up. Complements the canonical-rewrite plugin from #2566, which only covers paths served from the apify-docs build.The
alwaysflag keeps the header on 4xx/5xx so error pages aren't indexed either. Productiondocs.apify.comis unaffected (separate server block).