docker update

Dockerfile

@@ -1,15 +1,15 @@
 # Build stage
 FROM node:20-alpine AS builder
 WORKDIR /app
-COPY package.json package-lock.json ./
-RUN npm ci
+COPY package.json yarn.lock ./
+RUN yarn install
 COPY . .
 
 ENV PORT=5000
 ENV VERCEL_PROJECT_PRODUCTION_URL=http://194.59.214.243:5000
 ENV NEXT_PUBLIC_API_BASE_URL=http://194.59.214.243:5000/api
 
-RUN npm run build
+RUN yarn run build
 
 # Production stage
 FROM node:20-alpine AS runner
@@ -25,4 +25,4 @@ COPY --from=builder /app/node_modules ./node_modules
 VOLUME ["/app/contactMessages.json"]
 
 EXPOSE 5000
-CMD ["npm", "start"]
+CMD ["yarn", "start"]