Here is the command used:

docker build --build-arg plugins=ratelimit -t local/caddy github.com/abiosoft/caddy-docker.git

and the ouput error:

can't load package: package caddy:
ratelimit.go:2:10: invalid import path: ""
error at 'building caddy'

The plugin name ratelimit is found when I test with caddyplug install ratelimit.

Any idea what the problem is? how can I build this great caddy image with the ratelimit plugin?