Launching pm2 via a wrapper that launches pm2 as a daemon in the background
and then runs pm2 logs --raw in the foreground. This gets us the logs that
we want without the additional cruft that pm2 outputs by default
Summary:
Adds babel to K2
Creates a simple build script so it'll run on prod.
Test Plan: manual
Reviewers: jackie, halla, juan
Reviewed By: juan
Differential Revision: https://phab.nylas.com/D3527