Nextjs firebase apphosting help

Hey anyone hosted netxjs app using Firebase apphosting ? I want to use it but I don’t know how to hide environment variables as it doesn’t have a place to put env files, as in vercel we have a place to put all the envs. Firebase said Nextjs app can use the regular .env ( ignored when pushed to github btw ) but i am pushing my code to github which then triggers the build in apphosting also if i use apphosting.yaml file i am still sendinv that file to github again for firebase apphosting to use it, which defeats the point of hiding the envs