v0.4.0

Added

• App::port(host, container) builder for host-to-container port mapping
  (docker-compose ports), complementing expose() which only exposes
  within the Docker network (#8)
• --force flag on destroy command to skip interactive confirmation
  prompt for CI/CD and scripted workflows (#10)

Fixed

• Caddy now only depends on apps it actually proxies, not all apps in the
  stack; non-proxied apps no longer block Caddy startup (#9)

Changed

• BREAKING: Caddy::reverse_proxy() and Caddy::route() now require
  Upstream instead of impl Into<String>, callers must use
  App::upstream()
• Remove From<Upstream> for String impl
• Pipeline now supports multiple DNS providers; calling .dns() pushes
  to a vec instead of replacing the previous provider (#7)