fix: fix examples docker image build

Dockerfile

@@ -3,8 +3,10 @@ FROM --platform=$BUILDPLATFORM rust:slim-buster AS build
 
 ARG TARGETOS TARGETARCH
 
-RUN apt-get update && apt-get install -y git
-RUN apt-get update && apt-get install -y pkg-config
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git \
+    pkg-config \
+    python3
 
 RUN /bin/bash -c "if [ "${TARGETARCH}" == "arm64" ]; then apt-get install -y gcc-aarch64-linux-gnu g++-aarch64-linux-gnu ; else apt-get install -y gcc-x86-64-linux-gnu g++-x86-64-linux-gnu ; fi"
 
@@ -21,7 +23,12 @@ RUN mkdir -p xfer/example_utils && cp hydroflow/example_utils/* xfer/example_uti
 # Runtime stage
 FROM rust:slim-buster
 
-RUN apt-get update && apt-get install -y python3
+RUN \
+    apt-get update && \
+    apt-get install -y --no-install-recommends \
+        python3 \
+    && \
+    rm -rf /var/lib/apt/lists/*
 
 WORKDIR /usr/src/myapp
 COPY --from=build /usr/src/myapp/xfer/examples/* .