small updated around docker/compose/readme

docker/fpm/Dockerfile

@@ -1,4 +1,12 @@
 FROM php:8.2-fpm
 RUN apt-get update && apt-get install -y \
     libpq-dev \
-	&& docker-php-ext-install -j$(nproc) pdo pdo_pgsql \
+    libzip-dev \
+    unzip \
+    libonig-dev \
+    libxml2-dev && \
+	docker-php-ext-install -j$(nproc) pdo pdo_pgsql zip mbstring pcntl
+
+RUN php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" \
+&& php composer-setup.php --install-dir=/usr/local/bin --filename=composer \
+&& php -r "unlink('composer-setup.php');"