Assisted-by: GLM-5.1 via pi

diff --git a/fly.preview.toml b/fly.preview.toml
new file mode 100644
index 0000000..12f91db
--- /dev/null
+++ b/fly.preview.toml
@@ -0,0 +1,15 @@
+app = "domus-preview"
+primary_region = "sjc"
+
+[build]
+  dockerfile = "Dockerfile"
+
+[http_service]
+  internal_port = 9292
+  force_https = true
+  auto_stop_machines = true
+  auto_start_machines = true
+  min_machines_running = 0
+
+[env]
+  RACK_ENV = "production"