Dockerfile code style

Dockerfile

@@ -4,26 +4,28 @@ ADD https://github.com/ufoscout/docker-compose-wait/releases/download/2.7.3/wait
 
 RUN apt-get update && apt-get upgrade -y \
     && apt-get install apt-utils -y \
+    # Install main extension
     && apt-get install git zip vim libzip-dev libgmp-dev libevent-dev libssl-dev libnghttp2-dev libffi-dev -y \
     && docker-php-ext-install -j$(nproc) sockets zip gmp pcntl bcmath ffi \
-    && docker-php-source extract \
-    && cd /usr/src/php/ext/ \
+    # Install additional extension
+    && mkdir -p /usr/src/php/ext/ && cd /usr/src/php/ext/ \
     && pecl bundle event \
     && pecl bundle ev \
     && pecl bundle parallel \
     && docker-php-ext-configure event --with-event-core --with-event-extra --with-event-pthreads \
     && docker-php-ext-install -j$(nproc) ev event parallel \
+    # Install composer
+    && chmod +x /usr/local/bin/docker-compose-wait \
+    && curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer \
+    # Cleanup
     && docker-php-source delete \
     && apt-get autoremove --purge -y && apt-get autoclean -y && apt-get clean -y \
-    && rm -rf /usr/src \
-    && chmod +x /usr/local/bin/docker-compose-wait \
-    && curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
+    && rm -rf /usr/src
 
 COPY . /app
 WORKDIR /app
 
-RUN cd /app \
-    && cp -a docker/php/conf.d/. "$PHP_INI_DIR/conf.d/" \
+RUN cp -a docker/php/conf.d/. "$PHP_INI_DIR/conf.d/" \
     && composer install --no-dev \
     && composer clear