How to quickly set environment variables for specific branch deploys in Netlify.
In the target app, click Site configuration:
In the left menu click Environment variables:
Click Add a variable > Add a single variable:
Give the variable a key:
Under ‘Values’, select ‘Different value for each deploy context’:
Enter the values for each default context:
Click ‘+ Add a branch value (optional)’:
Enter the target branch name and the value specific to that branch:
Click ‘Create variable’