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The suites connected to localhost:<published port>, which works for a developer but not on a containerised runner: published ports live in the host's network namespace, so the runner container gets connection refused. Run them from inside the stack instead, against the gateway by service name. SITE_BASE_URL and SITE_HOST_HEADER make that possible without weakening what is under test: the Host stays "localhost", so the gateway's host check and TrustedHostMiddleware see exactly what a localhost run produces, and the tests that deliberately send their own Host still override it. S3_PUBLIC_ENDPOINT has to agree, because presigned URLs are signed against it and the signature covers the host, so it cannot be rewritten afterwards. CI points the whole stack at http://storage:9000 so the URLs it hands out are reachable by whoever follows them. The browser suites still need Chrome to reach the stack from the runner, which the same namespace split prevents. They now check reachability and skip with a warning instead of failing with a bare connection error; recorded as ROADMAP 5.10, since they are the only coverage for the artwork editor. Verified both ways: the six suites pass inside the network, and an unchanged developer localhost run still passes, as do both browser suites locally. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>