ci: add v prefix for publish step

Author: f2prateek

.circleci/config.yml

@@ -75,6 +75,6 @@ workflows:
             - test
           filters:
             tags:
-              only: /[0-9]+(\.[0-9]+)*(-.+)?/
+              only: /v[0-9]+(\.[0-9]+)*(-.+)?/
             branches:
               ignore: /.*/