Fixed CI

.gitlab-ci.yml

 image: alpine
 
-before_script:
+unit_test:
+  stage: test
+  script:
     - apk update
-  - apk add doxygen
     - apk add bash curl php7 php7-json php7-phar php7-mbstring php7-openssl
     - curl -s https://getcomposer.org/installer | php
     - alias composer='php composer.phar'
-
-unit_test:
-  stage: test
-  script:
     - composer install
     - composer test
 
@@ -18,6 +15,7 @@ pages:
   only:
     - master
   script:
+    - apk update && apk add doxygen
     - doxygen
     - mv docs/html/ public/
     - rmdir docs