Update Dockerfile

Dockerfile

@@ -1,11 +1,29 @@
-FROM python:3.9
-RUN useradd -m -u 1000 user
-USER user
-ENV HOME=/home/user \
-    PATH=/home/user/.local/bin:$PATH
-WORKDIR $HOME/app
-COPY --chown=user . $HOME/app
-COPY ./requirements.txt ~/app/requirements.txt
-RUN pip install -r requirements.txt
-COPY . .
-CMD ["chainlit", "run", "app.py", "--port", "7860"]
+FROM python:3.9-slim-bookworm
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1
+
+# Create non-root user
+RUN useradd -m -u 1000 app
+WORKDIR /app
+
+# Install Python deps first for caching
+COPY requirements.txt .
+RUN python -m pip install --upgrade pip \
+ && pip install --no-cache-dir -r requirements.txt
+
+# Copy app code and set ownership
+COPY --chown=app:app . .
+USER app
+
+# Hugging Face Spaces listens on this port by default
+ENV PORT=7860
+EXPOSE 7860
+
+# Healthcheck
+HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 \
+  CMD curl -fsS http://127.0.0.1:${PORT}/ || exit 1
+
+# Run Chainlit
+CMD ["sh", "-c", "chainlit run app.py --headless --host 0.0.0.0 --port ${PORT}"]