CI: Fix filter for docker-push-tag job

.circleci/config.yml

@@ -117,8 +117,8 @@ workflows:
               only: master
       - docker-push-tag:
           filters:
-            branches:
-              only: /v[0-9.]*/
+            tags:
+              only: /v.*/
   rebuild-images:
     triggers:
       - schedule: