ENV Variables and Vercel
The preferred workflow is to add ENV variables to Vercel, then pull them down. If you plan on hosting with Vercel, you'll need to do this step anyway.
Step 1: Add ENV vars to Vercel
Go to:
Your Project --> Settings --> Environment Variables
Step 2: Install the Vercel CLI
npm i -g vercel
Step 3: Initialize Vercel
Answer the questions in the command line when prompted.
vercel init
Step 4: Pull down the ENV variables
vercel env pull