Update Fly configuration for machine management

Author: maidi29

fly.toml

@@ -14,6 +14,9 @@ processes = []
   processes = ["app"]
   protocol = "tcp"
   script_checks = []
+  auto_stop_machines = "stop"
+  auto_start_machines = true
+  min_machines_running = 0
   [services.concurrency]
     hard_limit = 25
     soft_limit = 20