fix: set NODE_ENV after build so devDeps install for build

Dockerfile

@@ -1,10 +1,10 @@
 FROM node:22-alpine
 WORKDIR /app
-ENV NODE_ENV=production
-ENV PORT=4028
 COPY package*.json ./
 RUN npm install
 COPY . .
 RUN npm run build
+ENV NODE_ENV=production
+ENV PORT=4028
 EXPOSE 4028
 CMD ["npx", "next", "start", "-p", "4028"]