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deploy/prod/Dockerfile.backend

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+# Production image for the Django backend.
+# Runs migrations then serves the app with gunicorn on port 8000.
+# Static files are collected at build time into /app/staticfiles and
+# served by the backend itself behind the host nginx reverse proxy.
+
+FROM python:3.11-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    DJANGO_SETTINGS_MODULE=backend.settings
+
+WORKDIR /app
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends gcc \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir --upgrade pip \
+    && pip install --no-cache-dir -r requirements.txt gunicorn
+
+COPY . .
+
+RUN python manage.py collectstatic --noinput
+
+EXPOSE 8000
+
+CMD ["sh", "-c", "python manage.py migrate --noinput && exec gunicorn backend.wsgi:application --bind 0.0.0.0:8000 --workers 3"]