Getting the heroku build number from environment variables on the cedar stack

I noticed that heroku has a build version number i.e. v251 when you deploy to heroku. Is there any way that I can read that from my application, perhaps an environment variable? I have a node.js app on their cedar stack.

How do I access Heroku config vars in Python?

Heroku's environment variables are called config vars. To set a config var, navigate to the Settings tab of your app's dashboard, and click Reveal Config Vars.

Does heroku read .ENV file?

Heroku Local is a command-line tool to run Procfile-backed apps. It is installed automatically as part of the Heroku CLI. Heroku Local reads configuration variables from a . env file.

How about using the Dyno Metadata. It looks like the data you need is then just an environment variable away.