A docker image for CUPS geared towards exposing USB printers.

• multi-architecture:
  • linux/amd64
  • linux/arm64
• hardened:
  • image runs read-only
  • image runs with no capabilities
  • process runs as a non-root user, disabled login, no shell
• lightweight
  • based on our slim Debian Bookworm
  • simple entrypoint script
  • multi-stage build with zero packages cups, dbus, avahi-daemon, printer-driver-brlaser installed in the runtime image
• observable
  • healthcheck
  • log to stdout
  • prometheus endpoint

You need to run this in host or mac(or ip)vlan networking (because of mDNS).

• Unclear if we need dbus or not. Too lazy to check.

See DEVELOP.md