Avoid run cta-valgrind when we tag

.gitlab/ci/tests.gitlab-ci.yml

 cta_valgrind:
   stage: test
   rules:
+    - if: $CI_COMMIT_TAG
+      when: never
     - if: $CI_PIPELINE_SOURCE == "web"
       when: manual
       allow_failure: false
@@ -64,4 +66,4 @@ dbunittests_postgresql:
     - runuser -u postgres -- ${POSTGRES_BIN}/pg_ctl stop -D ${POSTGRESQL_DATA_DIR}
 
   tags:
-    - docker
\ No newline at end of file
+    - docker