run operator CI (at least optionally)

We should do "reverse dependency testing" and run the https://github.com/bootc-dev/bootc-operator CI at least optionally from here.

No file or test is named. Start by inspecting this repository's CI configuration and the bootc-operator CI linked in the issue, then determine how an optional reverse-dependency run should be triggered. Done means the operator's CI can be run from this repository without making it mandatory for the default workflow.

Written by the indexing model from the issue text.