FIX: path for docker build

.gitlab-ci.yml

@@ -83,8 +83,8 @@ build-testenv:
         -t $CI_REGISTRY_IMAGE .
       - docker push $CI_REGISTRY_IMAGE
       - docker save $CI_REGISTRY_IMAGE > /image-cache/caosdb-advanced-testenv.tar
+      - cd .docker-base
       - docker build 
-        --file .docker-base/Dockerfile
         -t $CI_REGISTRY_IMAGE_BASE .
       - docker push $CI_REGISTRY_IMAGE_BASE