Update circleci config

Author: Noarkhh

.circleci/config.yml

@@ -6,6 +6,25 @@ workflows:
   version: 2
   build:
     jobs:
-      - elixir/build_test
-      - elixir/test
-      - elixir/lint
+      - elixir/build_test:
+          filters: &filters
+            tags:
+              only: /v.*/
+      - elixir/test:
+          filters:
+            <<: *filters
+      - elixir/lint:
+          filters:
+            <<: *filters
+      - elixir/hex_publish:
+          requires:
+            - elixir/build_test
+            - elixir/test
+            - elixir/lint
+          context:
+            - Deployment
+          filters:
+            branches:
+              ignore: /.*/
+            tags:
+              only: /v.*/