unit tests don't need no database, re #606

.gitlab-ci.yml

@@ -24,8 +24,6 @@ Linting:
     - php -d memory_limit=-1 composer/bin/phplint
 
 Unit Test:
-  services:
-    - mariadb
   image: studip/studip:tests
   stage: Tests
   allow_failure: false
@@ -110,4 +108,4 @@ Release:
           link_type: package
         - name: "Stud.IP-Release-$CI_COMMIT_TAG.tar.gz"
           url: "${CI_API_V4_URL}/projects/${CI_PROJECT_ID}/jobs/${GE_JOB_ID}/artifacts/.pkg/studip-release-$CI_COMMIT_TAG.tar.gz"
-          link_type: package
\ No newline at end of file
+          link_type: package