Update .gitlab-ci.yml

.gitlab-ci.yml

-# This file is a template, and might need editing before it works on your project.
-# Select image from https://hub.docker.com/_/php/
 image: php:7.2
 
 # Select what we should cache between builds
@@ -8,16 +6,12 @@ cache:
   - vendor/
 
 before_script:
-# Install PHP extensions
 - docker-php-ext-install mbstring mcrypt pdo_pgsql curl json intl gd xml zip bz2 opcache
-# Install and run Composer
 - curl -sS https://getcomposer.org/installer | php
 - php composer.phar install
+- composer install --no-interaction --prefer-dist
 
 test:
-  before_script:
-    - composer install --no-interaction --prefer-dist
-
   script:
     - vendor/bin/tester ./tests/cases
     - vendor/bin/phpstan analyse --no-progress --level 7 src/