Update dockerfile

dockerfile

@@ -1,32 +1,55 @@
-# -------- Stage 1: base --------
+# --------------------------------------------------
+# Base Image
+# --------------------------------------------------
 FROM python:3.11-slim
 
-# -------- Env --------
+# --------------------------------------------------
+# Environment
+# --------------------------------------------------
 ENV PYTHONUNBUFFERED=1 \
     PYTHONDONTWRITEBYTECODE=1
 
-# -------- System deps (minimal) --------
+# --------------------------------------------------
+# System Dependencies (minimal)
+# --------------------------------------------------
 RUN apt-get update && apt-get install -y --no-install-recommends \
     curl \
     && rm -rf /var/lib/apt/lists/*
 
-# -------- Workdir --------
+# --------------------------------------------------
+# Workdir
+# --------------------------------------------------
 WORKDIR /app
 
-# -------- Dependencies --------
+# --------------------------------------------------
+# Python Dependencies
+# --------------------------------------------------
 COPY requirements.txt .
 RUN pip install --no-cache-dir -r requirements.txt
 
-# -------- App --------
-COPY app.py .
+# --------------------------------------------------
+# App
+# --------------------------------------------------
+COPY . .
 
-# -------- Non-root user --------
+# --------------------------------------------------
+# Create cache directory (important!)
+# --------------------------------------------------
+RUN mkdir -p /app/cache
+
+# --------------------------------------------------
+# Security: Non-root user
+# --------------------------------------------------
 RUN useradd -m appuser
 USER appuser
 
-# -------- Healthcheck --------
+# --------------------------------------------------
+# Healthcheck
+# --------------------------------------------------
 HEALTHCHECK --interval=30s --timeout=5s --retries=3 \
   CMD curl -f http://localhost:5000/healthz || exit 1
 
-# -------- Run --------
-CMD ["python", "app.py"]
+# --------------------------------------------------
+# Start (Production)
+# --------------------------------------------------
+CMD ["gunicorn", "-w", "2", "-k", "gthread", "-t", "60", "-b", "0.0.0.0:5000", "app:app"]