FIX: gitlab-ci now recognizes version tags.

.gitlab-ci.yml

@@ -47,7 +47,7 @@ build-testenv:
   image: docker:20.10
   script:
     - DOCKER_BASE_IMAGE="${CPPLIB_REGISTRY_IMAGE}"
-    - if [[ "${CI_COMMIT_REF_NAME}" == release* ]] ; then
+    - if [[ "${CI_COMMIT_REF_NAME}" == release* ]] || [[ "${CI_COMMIT_REF_NAME}" == v0* ]] ; then
         echo "Release detected, choosing cpplib image from 'main' branch." ;
         DOCKER_BASE_IMAGE="$CI_REGISTRY/caosdb/src/caosdb-cpplib/testenv:main" ;
       else