fix cache dir

Dockerfile

@@ -22,9 +22,10 @@ WORKDIR /app
 # Copy the Next.js build and node_modules from the builder stage
 COPY --from=builder /app /app
 
-# Create the cache directory and symbolic link
-RUN mkdir -p /tmp/app/.next && \
-    ln -s /tmp/app/.next/cache .next/cache
+# Create the cache directory and set permissions
+RUN mkdir -p /tmp/app/.next/cache && \
+    chmod -R 777 /tmp/app/.next && \
+    ln -s /tmp/app/.next/cache /app/.next/cache
 
 # Install PM2 globally
 RUN npm install -g pm2