apko include can loop forever by recursively included files.

[justinvreeland]

The feature is marked deprecated but it's useful and I'd like to use it. We could probably track the files that were included to check against.

~/scratch
❯ cat apko-loop.yaml 
include: ./apko-loop.yaml
❯ apko build ./apko-loop.yaml test test
2025/04/17 09:14:07 INFO including ./apko-loop.yaml for configuration
2025/04/17 09:14:07 INFO including ./apko-loop.yaml for configuration
...
2025/04/17 09:14:12 INFO including ./apko-loop.yaml for configuration
fish: Job 1, 'apko build ./apko-loop.yaml tes…' terminated by signal SIGTERM (Polite quit request)