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Deploy to the production host on push to master via a self-hosted act_runner (host/shell executor): git fetch + reset --hard in /opt/tanabata, then docker compose up -d --build. Shell-only steps, so the host needs just git and docker — no node, no rsync. docs/DEPLOY.md covers the one-time setup: what a runner is, the runner user, cloning to /opt/tanabata with a read-only deploy key, registering act_runner with the host label, and the host .env. Notes the security reason to scope the runner to this repository. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>