Publishing to an artifact host

A page is published with one request and gets an unlisted URL: public to anyone holding the link, but with a random suffix, no index, and noindex on the page. A URL looks like /2026/07/login-flow-k3f9dq, dated by the month it was first published, and replacing a page later keeps that date so its link never moves.

Setup

Two environment variables, and nothing else:

If either is missing the script says which one and stops. Report that rather than inventing a value or writing a config file: there is no config file to write.