docker run -d --network host --name caddy -p 80:80 -p 443:443 -v $(pwd)/Caddyfile:/etc/caddy/Caddyfile -v $(pwd)/caddy_data:/data caddy/caddy

Caddyfile

{
  # acme_ca https://acme-staging-v02.api.letsencrypt.org/directory
  email me@doesnt-exists.com
}

doesnt-exists.com {
  reverse_proxy {
    header_up X-Forwarded-Proto https
    to localhost:5000
  }
}