This docker image is expected to be used in a multistage build that requires a composer install step.
This image is a stable drop-in replacement for the official composer image if you already use it.
There are a couple of helper commands with some opinionated flags but the normal composer command is still available if you don't like the chosen defaults.
The below is geared towards a Laravel production build but can easily be tailored as needed.
FROM lslio/composer as composer
COPY ./composer.* /www/
RUN composer-install -d /www
COPY . /www
RUN composer-dump-autoload -d /www
FROM lslio/nginx-php-fpm
ENV SERVER_ROOT=/www/public
ENV SERVER_NAME=example.com
COPY --from=composer --chown=www-data:www-data /www /www