Add integration test

.gitlab-ci.yml

+variables:
+    GIT_STRATEGY: none
+  
+api_test:
+    tags:
+        - centos
+        - docker
+    artifacts:
+        paths:
+        - insite/tests/docker-compose.log
+        expire_in: 1 week
+        when: always
+    script:
+        - rm -rf insite
+        - git clone --branch feature/add-test-pipeline --single-branch --recurse-submodules https://devhub.vr.rwth-aachen.de/VR-Group/in-situ-pipeline/insite.git
+        - cd insite/info-node
+        - git checkout $CI_COMMIT_SHA
+        - cd ../tests
+        - pip3 install --user -r requirements.txt
+        - pytest
+  
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