Docker: How to install the php enchant extension

If I try to install the php enchant extension in the docker image php:8.1-fpm with RUN docker-php-ext-install enchant I get the following error: E: Unable to locate package libenchant-2 You need to install the missing enchant library in the dockerfile yourself (along with your wanted spellcheck language, in my case Swiss German): RUN apt-get install …