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github.server_url returns 'http://gitea:3000' (Gitea ROOT_URL using Docker service name). CI job containers run on an isolated network and can't resolve the 'gitea' hostname. host-gateway maps to the Docker bridge IP (172.17.0.1). Gitea publishes port 3000 on all interfaces, so http://gitea:3000 becomes reachable inside every job container via the bridge. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>