Initial import of liberta convert service

Dockerfile

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+FROM python:3.12
+
+RUN apt-get update && apt-get install -y --no-install-recommends libreoffice && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY app.py .
+
+EXPOSE 5000
+
+CMD ["python3", "app.py"]