Add deploy date step back to build

Author: jessamynsmith

.circleci/config.yml

@@ -7,6 +7,12 @@ workflows:
     jobs:
       - build
       - heroku/deploy-via-git:
+          pre-steps:
+            - run:
+              name: Set deploy date
+              command: |
+                DEPLOY_DATE=`date "+%FT%T%z"`
+                heroku config:set --app=$HEROKU_APP_NAME DEPLOY_DATE="$DEPLOY_DATE"
           post-steps:
             - run: heroku run python manage.py migrate --app $HEROKU_APP_NAME
           requires: