Override default ENV

By default, we use the most stable runtimes to support your app. However, if needed, you can change them. For instance:

• NODE_ENV: Defaults to "development," but you can override it.

• NODE_VERSION: (You can specify the version here.)

• GO_VERSION:

• PYTHON_VERSION

By default, all containerized applications use port 9999. You can change this by setting the PORT environment variable