chore: clean up root clutter

scripts/docker/sandbox/Dockerfile

@@ -0,0 +1,23 @@
+# syntax=docker/dockerfile:1.7
+
+FROM debian:bookworm-slim@sha256:f9c6a2fd2ddbc23e336b6257a5245e31f996953ef06cd13a59fa0a1df2d5c252
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN --mount=type=cache,id=openclaw-sandbox-bookworm-apt-cache,target=/var/cache/apt,sharing=locked \
+  --mount=type=cache,id=openclaw-sandbox-bookworm-apt-lists,target=/var/lib/apt,sharing=locked \
+  apt-get update \
+  && apt-get install -y --no-install-recommends \
+    bash \
+    ca-certificates \
+    curl \
+    git \
+    jq \
+    python3 \
+    ripgrep
+
+RUN useradd --create-home --shell /bin/bash sandbox
+USER sandbox
+WORKDIR /home/sandbox
+
+CMD ["sleep", "infinity"]