cambios para despliegue

Dockerfile

@@ -6,7 +6,7 @@ FROM node:20-alpine AS builder
 WORKDIR /app
 
 # Install Yarn 1 (classic) – ensures compatibility with existing lockfile
-RUN npm install -g yarn@1.22.19 && yarn --version
+RUN if ! command -v yarn >/dev/null || [ "$(yarn --version)" != "1.22.19" ]; then npm install -g yarn@1.22.19 && yarn --version; else echo "Yarn ${YARN_VERSION:-$(yarn --version)} already installed"; fi
 
 # Install dependencies (cache layer)
 COPY package.json .