prod build fix

frontend/Dockerfile

@@ -3,9 +3,9 @@ WORKDIR /app
 COPY frontend/package*.json /app/
 RUN npm ci || npm install
 COPY frontend /app
-RUN npm run build
+RUN npm run build:prod
 
-FROM nginx:1.29-alpine
+FROM nginx:mainline
 COPY frontend/nginx/default.conf /etc/nginx/conf.d/default.conf
 COPY --from=build /app/dist/routeros-backup-manager-next-ui/browser /usr/share/nginx/html
 EXPOSE 80