fix: ensure production server binds to 0.0.0.0

Author: hieuht09

Dockerfile

@@ -42,4 +42,4 @@ COPY --from=build /myapp/package.json /myapp/package.json
 COPY --from=build /myapp/.env /myapp/.env
 # Expose port and start application
 EXPOSE 3000
-CMD ["npm", "run", "start"]
+CMD ["npx", "shopify", "hydrogen", "preview", "--host", "0.0.0.0", "--port", "3000"]