create an jwt auth client for google apis
Usage
Make sure that you have this environment variable:
GOOGLE_API_SERVICE_ACCOUNT
See here how to setup a service account: https://github.com/theoephraim/node-google-spreadsheet#service-account-recommended-method
import { createAuth } from 'meteor/panter:google-api-auth'
const SCOPES = ['https://www.googleapis.com/auth/spreadsheets.readonly']
const auth = createAuth(SCOPES)