Forgejo's Actions artifact API hands the runner an upload URL built from
forgejo's ROOT_URL — the public forge domain (forge.<domain>), not the
runner's 127.0.0.1:<httpPort> registration URL. The hive-ci container shares
host netns but has no resolver entry for the hive's own domains (the
gateway's localHostsEntry only touches the host), so actions/upload-artifact
fails with 'getaddrinfo ENOTFOUND forge.<domain>' while normal CI (checkout
via the localhost registration URL) is unaffected. Add a networking.extraHosts
entry mapping the forge domain to loopback so the upload reaches the local
forge via the gateway.
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