Installing php-zmq extension on PHP 8.1 in a docker container

What is wrong with this Dockerfile?

FROM php:8.1-apacheRUN apt-get update && apt-get install -y libzmq5# Install the ZeroMQ extensionRUN pecl install zmq-beta# Enable the ZeroMQ extensionRUN docker-php-ext-enable zmq

It seems that I cannot install php-zmq extension in PHP 8.1. Any tips on how can I proceed with the installation?