Printing from Docker container

[abrain]

Printing via CUPS works fine if the application is run directly on the host. When running within a Docker container, the print job needs to be sent to the CUPS server on the host.

Documentation recommends to install CUPS into the container as well and use the CUPS_SERVER environment variable to redirect jobs to the host. lp still complains about "no default destination" and I was not able to resolve this within a reasonable amount of time.

Any hints or ideas are welcome.