for ei-prod only. I set up the ei EB env as prod level, but
have been working on launch changed in master branch. Easy enough to undo,
but I didn't wan't to mess with prod branch until done because
the launch scripts affect all the n1cloud-related environments.
Summary: This is a simple wrapper around `eb-deploy`. It checks that you're using the `production` branch when deploying to a production service. It also creates a tag whenever you make a new deploy so that we can track them.
Test Plan: Tested manually.
Reviewers: spang, juan, jerm
Reviewed By: jerm
Maniphest Tasks: T7870
Differential Revision: https://phab.nylas.com/D4045
