ci: set correct target directory for phpcs-job

.gitlab-ci.yml

@@ -7,7 +7,7 @@ phpcs:
   stage: test
   script:
   - composer global require squizlabs/php_codesniffer=^3
-  - /tmp/vendor/bin/phpcs -s -n -p --standard=PSR1,PSR2,PSR12 --no-cache --report=full --colors .
+  - /tmp/vendor/bin/phpcs -s -n -p --standard=PSR1,PSR2,PSR12 --no-cache --report=full --colors $CI_PROJECT_DIR
 #stages:
 #    - lint
 #  - release