I tried to install composer in a dockerfile using this code
FROM php:8.0-fpm
WORKDIR /app/php
RUN set update && set add curl && \
curl -sS https://getcomposer.org/installer --version=2.0.2 | PHP
but when I exec the container I find that the composer isn't installed
root@70c:/app/php# composer -v
bash: composer: command not found
What's wrong?, and how can I resolve this?