MAINT: removed unhelpful cache in cached-dind job

.gitlab-ci.yml

@@ -44,10 +44,8 @@ build-testenv:
     - time docker load < /image-cache/caosdb-server-testenv.tar || true
     - docker login -u gitlab-ci-token -p $CI_JOB_TOKEN $CI_REGISTRY
       # use here general latest or specific branch latest...
-    - docker pull $CI_REGISTRY_IMAGE || true
     - docker build
       --pull
-      --cache-from $CI_REGISTRY_IMAGE
       -t $CI_REGISTRY_IMAGE .
     - docker save $CI_REGISTRY_IMAGE > image.tar;
           mv image.tar /image-cache/caosdb-server-testenv.tar;