change port 3000 to 8080

Author: rrgks6221

Dockerfile

@@ -14,5 +14,5 @@ RUN npm run build \
   && npm prune --omit=dev   # devDependencies 제거로 이미지 슬림화
 
 ENV NODE_ENV=production
-EXPOSE 3000
+EXPOSE 8080
 CMD ["node", "dist/main.js"]