Add Dockerfile

Dockerfile

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+FROM python:3.12-slim
+
+# Install a few basics (certs for HTTPS, curl for healthchecks/debug)
+RUN apt-get update \
+  && apt-get install -y --no-install-recommends ca-certificates curl \
+  && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY requirements.txt /app/requirements.txt
+RUN pip install --no-cache-dir -r /app/requirements.txt
+
+COPY bgw210-700_prom_collector.py /app/bgw210-700_prom_collector.py
+
+# Optional: run as a non-root user
+RUN useradd -r -u 10001 appuser && chown -R appuser:appuser /app
+USER appuser
+
+EXPOSE 8000
+
+# Defaults; Compose can override via environment/command
+CMD ["python", "/app/bgw210-700_prom_collector.py", "--ip", "192.168.1.254", "--port", "8000"]