Fix circle workflow

Author: tommysitu

.circleci/config.yml

@@ -45,7 +45,10 @@ workflows:
   version: 2
   pipeline:
     jobs:
-      - build
+      - build:
+          filters:
+            tags:
+              only: /^v[0-9]+(\.[0-9]+)*(-rc\.[0-9]+)?$/
       - release:
           requires:
             - build