Generate backend file for GCS with terragrunt

Why

When using terragrunt, we want to generate files to keep deployments DRY. We can use a built-in function to create the backend file

How

# terragrunt.hcl
remote_state {
  backend = "gcs"
  generate = {
    path      = "backend.tf"
    if_exists = "overwrite_terragrunt"
  }
  config = {
    project  = "<>"
    location = "eu"
    bucket   = "<>"
    prefix   = "${path_relative_to_include()}"
    skip_bucket_creation = true
  }
}

What it generates

# backend.tf
# Generated by Terragrunt. Sig: nIlQXj57tbuaRZEa
terraform {
  backend "gcs" {
    bucket = "<>"
    prefix = "sandbox"
  }
}

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