add dockerfile

Dockerfile

@@ -0,0 +1,35 @@
+# Use a lightweight Python base
+FROM python:3.12-slim
+
+# Set environment variables
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+
+# Set work directory
+WORKDIR /app
+
+# Install system dependencies (if needed for pip packages)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy requirements first (for caching)
+COPY requirements.txt /app/
+
+# Install Python dependencies
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Copy the rest of the app
+COPY . /app/
+
+# Expose Flask port
+EXPOSE 5000
+
+# Default env vars (can override at runtime)
+ENV FLASK_APP=app:create_app
+ENV FLASK_RUN_HOST=0.0.0.0
+ENV FLASK_RUN_PORT=5000
+ENV FLASK_ENV=production
+
+# Start Flask with Gunicorn (better for prod than flask run)
+CMD ["gunicorn", "-w", "4", "-b", "0.0.0.0:5000", "app:create_app()"]

requirements.txt

@@ -1,2 +1,3 @@
 Flask==3.0.3
-python-dotenv==1.0.1
+python-dotenv==1.0.1
+gunicorn==22.0.0