How to specify env with terraform and github actions so valid environment.rb file will be used in Google Cloud Run with docker image [closed]

I am setting up a staging server on GCP.

Steps followed are -

1. Uploaded docker image to Artifact Registry
2. Using Cloud SQL for database
3. Using Cloud Run

I am using terraform configuration. I can deploy it but it shows me an error for host so added the following hosts in staging.rb, development.rb and production.rb

config.hosts << 'URL generated by cloud run'

It works after adding in all environment.rb file but I want it to be specific just for staging.rb

Can you please help. Thank you