fix yarn

Dockerfile

@@ -3,11 +3,13 @@ FROM node:20-alpine AS builder
 
 # Install node and yarn
 RUN apk add --no-cache nodejs npm
-RUN npm install -g yarn
 
 # Enable Corepack
 RUN corepack enable
 
+# Install latest yarn
+RUN corepack prepare yarn@stable --activate
+
 WORKDIR /app
 
 COPY package.json yarn.lock ./