Tests depend on skopeo now

[michaelsauter]

https://github.com/opendevstack/ods-pipeline/blob/master/test/tasks/ods-package-image_test.go#L130 introduces a dependency on skopeo. This is currently not covered by make check-system. We either need to add it there, or find a way to do the check without skopeo. I would prefer the latter if possible (using docker may work, which is already required).

FYI @henrjk Thoughts?

[henrjk]

I will try whether this can be done with docker.

[henrjk]

I spotted another usage of skopeo:

https://github.com/opendevstack/ods-pipeline/blob/ca46bcb944f2a9c108324b15148f156112caf2b0/test/tasks/ods-deploy-helm_external_test.go#L124

[michaelsauter]

Transferring as a consequence of opendevstack/ods-pipeline#722.

[henrjk]

I am not sure where one would add a local system check to also include skopeo.