add workflows

Author: gkorland

.circleci/config.yml

@@ -36,3 +36,19 @@ jobs:
       - run:
           name: run tests
           command: bundle exec rspec
+
+workflows:
+  version: 2
+  commit:
+    jobs:
+      - build
+  nightly:
+    triggers:
+      - schedule:
+          cron: "0 0 * * *"
+          filters:
+            branches:
+              only:
+                - master
+    jobs:
+      - build