Dockerization + ai review recomendations.

docker/Dockerfile.librarian

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+FROM python:3.11-slim
+
+ENV PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+        build-essential \
+        poppler-utils \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY conjurer_librarian/requirements_librarian.txt /tmp/requirements.txt
+RUN pip install -r /tmp/requirements.txt
+
+COPY . /app
+
+RUN useradd --create-home appuser \
+    && chown -R appuser:appuser /app
+
+USER appuser
+
+CMD ["python", "-m", "conjurer_librarian.conjurer_librarian"]