Merge pull request #110 from xenit-eu/fix-gradle-xenit-plugin

fix xenit gradle docker plugin and add docker-compose to ci

.github/workflows/ci.yml

@@ -28,6 +28,8 @@ jobs:
       - uses: actions/setup-java@v1
         with:
           java-version: 1.11
+      - name: install docker-compose
+        run: sudo apt-get install docker-ce docker-compose
       - name: Add license
         run: |
           touch ./src/integrationTest/resources/license61/license.lic