Include full contents of all nested repositories

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

openclaw/Dockerfile.sandbox

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+FROM debian:bookworm-slim@sha256:98f4b71de414932439ac6ac690d7060df1f27161073c5036a7553723881bffbe
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update \
+  && apt-get install -y --no-install-recommends \
+    bash \
+    ca-certificates \
+    curl \
+    git \
+    jq \
+    python3 \
+    ripgrep \
+  && rm -rf /var/lib/apt/lists/*
+
+RUN useradd --create-home --shell /bin/bash sandbox
+USER sandbox
+WORKDIR /home/sandbox
+
+CMD ["sleep", "infinity"]