fix: update dockerfile

Dockerfile

@@ -1,14 +1,12 @@
 # Build stage
-FROM node:20-alpine as build
-ARG APP_DIR=app
-RUN mkdir -p ${APP_DIR}
-WORKDIR ${APP_DIR}
+FROM node:20-alpine AS builder
+WORKDIR /app
 
-COPY package*.json ./src/ ./
-RUN npm install
-CMD ["npm", "run", "build"]
+COPY . .
+RUN npm ci
+RUN npm run build
 
 # Run stage
-FROM node:20-alpine
-COPY --from=build ./build ./
-CMD ["node", "index.js"]
+FROM node:20-alpine AS runner
+COPY --from=builder /app/build .
+CMD ["node", "index.js"]