diff --git a/builder/modal-builder/fly.preview.toml b/builder/modal-builder/fly.preview.toml
new file mode 100644
index 0000000..0a26845
--- /dev/null
+++ b/builder/modal-builder/fly.preview.toml
@@ -0,0 +1,22 @@
+# fly.toml app configuration file generated for modal-builder-preview on 2024-01-25T09:26:31Z
+#
+# See https://fly.io/docs/reference/configuration/ for information about how to use this file.
+#
+
+app = 'modal-builder-preview'
+primary_region = 'sea'
+
+[build]
+
+[http_service]
+  internal_port = 8080
+  force_https = true
+  auto_stop_machines = true
+  auto_start_machines = true
+  min_machines_running = 0
+  processes = ['app']
+
+[[vm]]
+  cpu_kind = 'shared'
+  cpus = 1
+  memory_mb = 1024