Add testrunner to gitlab ci file

.gitlab-ci.yml

@@ -17,6 +17,16 @@ build:
       - build
       - .gradle
 
+test:
+  stage: test
+  script: gradle --build-cache test
+  cache:
+    key: "$CI_COMMIT_REF_NAME"
+    policy: push
+    paths:
+      - build
+      - .gradle
+
 artifact:
   stage: deploy
   script: gradle publish