Variables, Validation and Outputs

This machine has OpenTofu, the open-source tool that reads the same configuration language as Terraform. Run it as tofu (terraform runs the same program). There is no network: the local, random and null providers are already installed.

/home/student/infra/reportd/main.tf writes a config file for the dev environment, with dev typed in by hand twice.

Task

• Add an input variable environment (a string) with default dev. It must reject any value other than dev, staging or prod.
• Use it in both places where dev is hard-coded today.
• Set it to staging in terraform.tfvars (not on the command line) and apply, so /home/student/out/reportd-staging.conf exists with env=staging.
• Add an output config_path with the path of the generated file.