feat: add Terraform partial for ACME DNS challenge

Author: saitho

templates/acme_dns_challenge.tf

@@ -0,0 +1,7 @@
+# Partial for acme_certificate Terraform module
+  dns_challenge {
+    provider = "cloudflare"
+    config = {
+      CF_DNS_API_TOKEN: "{{ module.config.cloudflare_api_token }}"
+    }
+  }