Similar to #6363 after update caddy doesn't start with error

2024/06/04 10:49:48.000	INFO	using config from file	{"file": ".serve/Caddyfile.preview"}
Error: ambiguous config file format; please specify adapter (use --adapter)

$ caddy version
v2.8.4 h1:q3pe0wpBj1OcHFZ3n/1nl4V4bxBrYoSoab7rL9BMYNk=

Note that I use config from subfolder .serve

Is it possible that filepath.Base function does not handle that case correctly?
https://github.com/omalk98/caddy/blob/3f55efcfde09bc3d0a56597b1280dd2289805f69/cmd/main.go#L150