Update Dockerfile

Dockerfile

@@ -5,5 +5,6 @@ RUN npm i # 推荐使用 pnpm i
 RUN npm run build
 # 设置环境变量，此处为随机字符
 ENV BASE_URL="https://ai.fakeopen.com"
+ENV OPENAI_API_KEY="pk-this-is-a-real-free-pool-token-for-everyone"
 EXPOSE 3000
 CMD ["npm", "run", "start"]