TASK: Generate multiple reports

* As no further calls are made once a call failed.
* Therefore call all reports in a single command.

.gitlab-ci.yml

@@ -30,8 +30,7 @@ lint:coding-guideline:
   image: php:7.0-alpine
   stage: test
   script:
-    - ./vendor/bin/phpcs -s -n
-    - ./vendor/bin/phpcs -s -n > result/phpcs-summary.txt
+    - ./vendor/bin/phpcs -s -n --report-full=result/phpcs-full.txt --report-diff=result/phpcs-diff.txt --report-summary=result/phpcs-summary.txt
   artifacts:
     when: on_failure
     paths: