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act_runner spawns an ephemeral container per job; the default image lacks the docker CLI and cannot reach the host's Docker daemon. Use the official docker:27-cli image and bind-mount /var/run/docker.sock so docker build/push target the host engine. Requires runner config.yaml to include /var/run/docker.sock in container.valid_volumes; otherwise the mount is rejected. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>