WS 78 fix datafetcher tests

ci/unit-test.template.yml

 .unit-test:
+    image: ${REGISTRY_URL}/${PROJECT_NAME}/${SERVICE_NAME}:${CI_COMMIT_SHORT_SHA}
     script:
-        - IMAGE_NAME="${REGISTRY_URL}/${PROJECT_NAME}/${SERVICE_NAME}"
-        - TEST_CONTAINER="${SERVICE_NAME}-${CI_COMMIT_SHORT_SHA}"
-        - docker run --name "${TEST_CONTAINER}" ${IMAGE_NAME}:${CI_COMMIT_SHORT_SHA} ./bin/run-tests.sh -b
-        - docker cp "${TEST_CONTAINER}":/code/.coverage ./.coverage.${SERVICE_NAME}.${CI_COMMIT_SHORT_SHA}
-        - docker container stop "${TEST_CONTAINER}" && docker container rm "${TEST_CONTAINER}"
+        - cd /code && ./bin/run-tests.sh -b
+    artifacts:
+        name: ".coverage.${SERVICE_NAME}.${CI_COMMIT_SHORT_SHA}"
+        paths:
+          - .coverage
     rules:
         - if: $CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH
-          when: always
-        - if: '$CI_PIPELINE_SOURCE == "merge_request_event"'
-          when: always
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+        - if: '$CI_PIPELINE_SOURCE == "merge_request_event"'
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