created new role

roles/trade_hub/files/trade-hub/backend/Dockerfile

@@ -0,0 +1,25 @@
+FROM docker.io/library/python:3.12-slim
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends curl ca-certificates \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY . .
+
+# Download the full scunpacked dataset at build time so the image is
+# self-contained; fetch_data.py reduces items.json to commodities.json.
+RUN python scripts/fetch_data.py --output-dir /app/data/full
+ENV DATA_DIR=/app/data/full
+
+RUN useradd --create-home appuser \
+    && chown -R appuser:appuser /app
+USER appuser
+
+EXPOSE 8000
+
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]