Archive terraform-nomad repository

The terraform-nomad project is being decommissioned; mark it archived
in Gitea so it becomes read-only, consistent with other retired repos
in this config (e.g. rpmbuild-template).

config/git.unkin.net/unkin/repository/terraform-nomad.yaml

@@ -2,6 +2,7 @@ description: "Manage nomad with Terraform"
 private: false
 default_branch: "master"
 default_delete_branch_after_merge: true
+archived: true
 branch_protection:
   - rule_name: "master"
     enable_push: false