fix: update Dockerfile to create and set permissions for .next directory during build process

Dockerfile

@@ -40,8 +40,8 @@ RUN adduser --system --uid 1001 nextjs
 COPY --from=builder /app/public ./public
 
 # Set the correct permission for prerender cache
-mkdir .next
-chown nextjs:nodejs .next
+RUN mkdir .next
+RUN chown nextjs:nodejs .next
 
 # Automatically leverage output traces to reduce image size
 # https://nextjs.org/docs/advanced-features/output-file-tracing