feat: 添加Docker配置，集成my_oss图片服务

Dockerfile

@@ -0,0 +1,13 @@
+FROM node:20-alpine
+
+WORKDIR /app
+
+COPY package*.json ./
+RUN npm install
+
+COPY . .
+RUN npm run build
+
+EXPOSE 3000
+
+CMD ["npm", "start"]