I’m using Firebase AppHosting to host Next.js. Since there are multiple environments for different branches of the same repository, I would like to switch the contents of apphosting.yaml, which specifies environment variables, for each branch. In this case, is there no choice but to obtain all values ​​from GCP’s secrets manager? Also, the only way to separate Cloud Run settings for each environment is to create separate repositories.

The official documentation is below.
https://firebase.google.com/docs/app-hosting/configure?hl=ja

I’ve searched a lot but can’t seem to find anyone having the same problem.