Add a simple oled display controller

oled/Dockerfile

@@ -0,0 +1,41 @@
+# syntax=docker/dockerfile:1
+
+# ── Stage 1: build ────────────────────────────────────────────────────────────
+FROM ros:kilted AS builder
+
+SHELL ["/bin/bash", "-c"]
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    python3-colcon-common-extensions \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /ws
+COPY oled/src/raspbot_oled/ src/raspbot_oled/
+
+RUN source /opt/ros/${ROS_DISTRO}/setup.bash && \
+    colcon build --packages-select raspbot_oled
+
+# ── Stage 2: runtime ──────────────────────────────────────────────────────────
+FROM ros:kilted-ros-core
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ros-${ROS_DISTRO}-rclpy \
+    ros-${ROS_DISTRO}-sensor-msgs \
+    python3-venv \
+    python3-smbus \
+    fonts-dejavu-core \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN python3 -m venv /opt/oled-venv --system-site-packages && \
+    /opt/oled-venv/bin/pip install --no-cache-dir luma.oled psutil
+
+COPY --from=builder /ws/install /ws/install
+
+RUN echo "source /opt/ros/${ROS_DISTRO}/setup.bash" >> /etc/bash.bashrc && \
+    echo "source /ws/install/setup.bash"             >> /etc/bash.bashrc
+
+COPY docker-entrypoint.sh /docker-entrypoint.sh
+RUN chmod +x /docker-entrypoint.sh
+
+ENTRYPOINT ["/docker-entrypoint.sh"]
+CMD ["/opt/oled-venv/bin/python3", "-m", "raspbot_oled.oled_node"]