[TASK] Install Composer for php-codesniffer

.gitlab-ci.yml

@@ -46,6 +46,10 @@ php-codesniffer:
   only:
     changes:
       - packages/**/*.php
+  before_script:
+    - apt -y update > /dev/null
+    - apt -y install zip > /dev/null
+    - curl -sS https://getcomposer.org/installer | php && mv ./composer.phar /usr/local/bin/composer
   script:
     - rm ./composer.json && rm ./composer.lock
     - composer require --dev squizlabs/php_codesniffer