feat: enable consul state store for artifactapi (#77)

enable the terraform-artifactapi system to manage its state in consul
using dynamic credentials from kubernetes ci jobs in woodpecker

---------

Co-authored-by: Ben Vincent <ben@unkin.net>
Reviewed-on: #77

resources/secret_backend/consul_root/au/syd1/terraform-artifactapi.hcl

@@ -0,0 +1,7 @@
+key_prefix "infra/terraform/artifactapi/" {
+  policy = "write"
+}
+
+session_prefix "" {
+  policy = "write"
+}