Add Push Non-master Branch to Heroku as a devops til.

devops/push-non-master-branch-to-heroku.md

@@ -0,0 +1,26 @@
+# Push Non-master Branch To Heroku
+
+When using git to deploy your app to Heroku, it is expected that you push
+to the `master` branch. When you run the following command
+
+```
+$ git push heroku master
+```
+
+Heroku will attempt to build and run your app. However, if you have a
+`staging` branch for your application that you want to push to your
+staging environment on Heroku, you cannot simply run
+
+```
+$ git push heroku staging
+```
+
+Heroku will only perform a build on pushes to the remote `master` branch.
+You can get around this, though, by specifying that your `staging` branch
+should be pushed to the remote `master` branch, like so
+
+```
+$ git push heroku staging:master
+```
+
+[source](https://coderwall.com/p/1xforw/make-heroku-run-a-non-master-branch)