v1.2

Dockerfile

@@ -14,5 +14,7 @@ COPY . .
 
 EXPOSE 5000
 
-# Keep testing and local dev via `flask` if desired; docker runs the app directly.
-CMD ["python", "app.py"]
+# Use Gunicorn (production WSGI server) in Docker.
+# We keep the container compatible with the PORT env var used in docker-compose.
+# JSON-form CMD doesn't expand env vars, so we use a shell form here.
+CMD ["sh", "-c", "gunicorn --bind 0.0.0.0:${PORT:-5000} --workers 2 --threads 4 app:app"]