Container image for running plugin-tests

[m-bucher]

Thanks, some more research also finds an already existing topic; I probably should continue the discussion there

Testing plugins using containers and GH actions

The problem I am maintaining the rh_cloud plugin that has a hard dependency on Katello. The plugin uses GH Actions to test my PRs. Katello requires certain OS dependencies, like qpid e.t.c. The problem starts with the fact that GH Actions runs on ubuntu, but Katello dependencies are not available there. Intermediate solution: Run containerized GH action. This is a good solution that enables us to run our work on a centos-like environment. PR for reference: gh_actions to container by ShimShtein …