Update package manager command in Dockerfile

Dockerfile

@@ -9,7 +9,7 @@ WORKDIR /app
 # Install dependencies based on the preferred package manager
 COPY package.json yarn.lock* package-lock.json* pnpm-lock.yaml* ./
 RUN \
-    if [ -f yarn.lock ]; then yarn; \
+    if [ -f yarn.lock ]; then yarn --frozen-lockfile; \
     elif [ -f package-lock.json ]; then npm ci; \
     elif [ -f pnpm-lock.yaml ]; then yarn global add pnpm && pnpm i --frozen-lockfile; \
     else echo "Lockfile not found." && exit 1; \