feat: daily paper rss generator with dockerfile + entrypoint

Dockerfile

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+# ─────────────────────────────────────────────
+# HuggingFace Daily Paper RSS — Dockerfile
+# ─────────────────────────────────────────────
+# Two modes:
+#   1. Run-once (default, for cron):
+#        docker run --rm -v ./feeds:/data hf-paper-rss
+#   2. HTTP server (serve feeds):
+#        docker run --rm -p 8080:8080 -v ./feeds:/data hf-paper-rss serve
+# ─────────────────────────────────────────────
+
+FROM python:3.11-slim AS base
+
+WORKDIR /app
+
+# Install system deps
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+# Install Python deps
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy app code
+COPY parser.py rss_generator.py run.py run.sh ./
+
+# Create output directory
+RUN mkdir -p /data && chmod 777 /data
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD python -c "import sys; sys.exit(0 if __import__('os').path.exists('/data/feed.xml') else 1)" \
+    || true  # Allow healthcheck to be optional
+
+ENTRYPOINT ["python", "run.py"]
+CMD ["--output-dir", "/data"]
+
+
+# ─── Serve mode ───
+FROM base AS serve
+
+COPY server.py .
+
+EXPOSE 8080
+
+ENTRYPOINT ["python", "server.py"]
+CMD ["--dir", "/data", "--port", "8080"]