add workflows

Author: gkorland

.circleci/config.yml

@@ -16,3 +16,20 @@ jobs:
       - run: go get -v -t -d ./...
       - run: go test -v ./... -race -coverprofile=coverage.txt -covermode=atomic
       - run: bash <(curl -s https://codecov.io/bash) -t ${CODECOV_TOKEN}
+      
+workflows:
+  version: 2
+  commit:
+    jobs:
+      - build
+  nightly:
+    triggers:
+      - schedule:
+          cron: "0 0 * * *"
+          filters:
+            branches:
+              only:
+                - master
+    jobs:
+      - build
+