added n8n

terraform.tfvars

@@ -209,7 +209,8 @@ nodes = {
         qemu_guest_agent = false
         # Rendered with templatefile(): ${gitea_runner_token} comes from
         # Infisical (GITEA_RUNNER_TOKEN in secrets.tmpl), so the token is
-        # never committed.
+        # never committed. Also runs n8n on :5678 (N8N_* secrets, Postgres
+        # on argo); see the prerequisites in the Butane file.
         butane_file = "butane/oswald_runner.yaml.tftpl"
       }
       "ai" = {