'Sourcing bucket and key values from environment variables in CICD

I am trying to setup a CICD for terraform changes. Our backed is S3 and while init I get following errors, since of course none of these values are provided:

terraform {
  backend "s3" {
  }
}

│ Error: "region": required field is not set
│ Error: "bucket": required field is not set
│ Error: "key": required field is not set

Value for region as specified here can be sourced from AWS_DEFAULT_REGION and AWS_REGION environment variables.

However, no information is available about how bucket and key information can be stored as repository secrets or environment variables and can be sourced from there?

I cant specify them in the backend.tf files due to some other limitations and they have to be stored as environment variables. Any idea how to fix this?

gitlab terraform gitlab-ci

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'Sourcing bucket and key values from environment variables in CICD

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