PR plan pipelines were failing with "Error acquiring the state lock" when they collided with a concurrent apply (or another plan) holding the lock on the same Consul-backed state. - plan: pass -lock=false to terragrunt plan; apply keeps locking
The generated backend.tf defines a terraform variable, so the Makefile must export the API key as TF_VAR_sonarr_api_key rather than SONARR_API_KEY.