feat(docker): harden and productionize image build

Dockerfile

@@ -1,18 +1,30 @@
+# Use an official Python runtime as a base
 FROM python:3.11-slim-buster
 
-# Install build dependencies (build-essential provides gcc and other tools)
-RUN apt-get update && apt-get install -y build-essential
+# Set working directory
+WORKDIR /app
 
-WORKDIR /rideaware_landing
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    build-essential \
+    libpq-dev \
+    && rm -rf /var/lib/apt/lists/*
 
+# Copy requirements first to leverage Docker cache
 COPY requirements.txt .
 
+# Install Python dependencies
 RUN pip install --no-cache-dir -r requirements.txt
 
+# Copy application code
 COPY . .
 
-ENV FLASK_APP=server.py
+# Environment variables
+ENV FLASK_APP=app.py
+ENV FLASK_ENV=production
+ENV ENVIRONMENT=production
 
 EXPOSE 5001
 
-CMD ["gunicorn", "--bind", "0.0.0.0:5001", "app:app"]
+# Use Gunicorn as production server
+CMD ["gunicorn", "--bind", "0.0.0.0:5001", "--workers", "4", "--timeout", "120", "app:app"]