add some swap space to fly config to try and fix the memory issue

https://community.fly.io/t/ran-out-of-memory-and-crashed/19312/3

Author: MoralCode

fly.toml

@@ -6,6 +6,8 @@
 app = "classclockapi"
 primary_region = "den"
 
+swap_size_mb = 512
+
 [http_service]
   internal_port = 8000
   force_https = true