The compose healthcheck probes http://127.0.0.1:81/api, but the binary
defaults ADMIN_PORT to 8081, so a stock compose up never becomes healthy.
Set ADMIN_PORT, PROXY_HTTP_PORT, and PROXY_HTTPS_PORT in compose so the
process listens on the Dockerfile EXPOSE ports. Document real binary
defaults in the README and keep the Docker section on 80/81/443 via env.
Link: #10
Ash