chore(docker): add Dockerfile for backend and docker-compose

Author: ergon73

.dockerignore

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+.git
+node_modules
+frontend/node_modules
+.venv
+__pycache__
+*.py[cod]
+*.log
+build
+frontend/build
+*.env
+env
+.env
+
+

backend/Dockerfile

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+FROM python:3.12-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1
+
+WORKDIR /app
+
+# System deps for WeasyPrint (cairo/pango/gdk-pixbuf) and fonts
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libcairo2 \
+    libpango-1.0-0 \
+    libpangoft2-1.0-0 \
+    libgdk-pixbuf-2.0-0 \
+    shared-mime-info \
+    fonts-liberation \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY backend/requirements.txt /app/backend/requirements.txt
+RUN pip install --no-cache-dir -r /app/backend/requirements.txt
+
+COPY backend /app/backend
+
+ENV TEST_MODE=true \
+    FLASK_DEBUG=0
+
+EXPOSE 5000
+WORKDIR /app/backend
+
+CMD ["python", "pdf_server.py"]
+
+

docker-compose.yml

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+services:
+  backend:
+    build:
+      context: ./backend
+    environment:
+      TEST_MODE: "${TEST_MODE:-true}"
+      FLASK_DEBUG: "0"
+      API_KEY: "${API_KEY:-}"
+    ports:
+      - "5000:5000"
+
+  frontend:
+    build:
+      context: ./frontend
+      args:
+        REACT_APP_API_URL: "http://backend:5000"
+    ports:
+      - "3000:80"
+    depends_on:
+      - backend
+
+