Require provider api_key and remove env var fallback

examples/live_safe_dns_record/README.md

@@ -18,7 +18,7 @@ Using a single suffix (`test_suffix`), this example creates five DNS record scen
 ## Prerequisites
 
 - Local provider binary + Terraform `dev_overrides` for `dynu/dynu`
-- `DYNU_API_KEY` exported, or `dynu_api_key` set in `terraform.tfvars`
+- `dynu_api_key` set in `terraform.tfvars`
 - A Dynu-managed root domain you control
 
 ## Configure

examples/live_safe_dns_record/terraform.tfvars.example

@@ -1,5 +1,4 @@
-# Optional if DYNU_API_KEY is exported in your shell.
-# dynu_api_key = "REPLACE_ME"
+dynu_api_key = "REPLACE_ME"
 
 # Required: a Dynu-managed root domain/zone that you control.
 # Do NOT put an existing production hostname here.

examples/live_safe_dns_record/variables.tf

@@ -1,5 +1,5 @@
 variable "dynu_api_key" {
-  description = "Dynu API key. Leave null to use DYNU_API_KEY from environment."
+  description = "Dynu API key used by the provider. Set in terraform.tfvars."
   type        = string
   default     = null
   sensitive   = true