See armhfbuild/caddy for Docker images. Upstream project is mholt/caddy.
To configure edit Caddyfile
.
Example to run Caddy:
docker run \
--detach \
--name caddy \
--volume $PWD/Caddyfile:/Caddyfile \
--volume $PWD/certs:/root/.caddy \
--volume $PWD/www:/var/www \
--link drone \
--link registry \
--publish 80:80 \
--publish 443:443 \
local/caddy