Merge pull request #54 from mozilla/workflow-to-ci-tags

add circleci workflow so we build tags

.circleci/config.yml

@@ -57,3 +57,21 @@ jobs:
             if [ $? == 0 ]; then
               bin/ci/deploy-dockerhub.sh "`git describe`"
             fi
+
+workflows:
+  version: 2
+
+  # workflow jobs are _not_ run in tag builds by default
+  # we use filters to whitelist jobs that should be run for tags
+
+  # workflow jobs are run in _all_ branch builds by default
+  # we use filters to blacklist jobs that shouldn't be run for a branch
+
+  # see: https://circleci.com/docs/2.0/workflows/#git-tag-job-execution
+
+  build-test-push:
+    jobs:
+      - build:
+          filters:
+            tags:
+              only: /.*/