Also copy .yarn

Dockerfile

@@ -8,7 +8,7 @@ RUN apk add --no-cache libc6-compat
 WORKDIR /app
 
 # Install dependencies based on the preferred package manager
-COPY package.json yarn.lock* package-lock.json* pnpm-lock.yaml* .yarnrc.yml .nvmrc ./
+COPY package.json yarn.lock* package-lock.json* pnpm-lock.yaml* .yarnrc.yml .nvmrc .yarn ./
 RUN corepack enable
 RUN yarn install --immutable