Docker env update

Dockerfile

@@ -4,6 +4,15 @@ RUN apt-get update && apt-get install -y zip libzip-dev libpng-dev \
     && docker-php-ext-install pdo_mysql gd zip \
     && rm -rf /var/lib/apt/lists/*
 
+# Composer installation.
+COPY --from=composer:latest /usr/bin/composer /usr/bin/composer
+
+# https://getcomposer.org/doc/03-cli.md#composer-allow-superuser
+ENV COMPOSER_ALLOW_SUPERUSER=1
+RUN composer global require hirak/prestissimo --prefer-dist --no-progress --no-suggest --classmap-authoritative \
+	&& composer clear-cache
+ENV PATH="${PATH}:/root/.composer/vendor/bin"
+
 COPY . /var/www/html/
 
 # Authorize these folders to be edited