Branching package/project looses repo type but copies most other information just fine

[okurz]

Issue/Feature Description

As discussed in os-autoinst/openQA#2295 I branched a package which automatically branched a project for me. This also automatically branched/copied linked packages within the same project. The problem I observed was that the container build using a Dockerfile could not anymore properly resolve its dependencies. As explained in os-autoinst/openQA#2295 (comment) the root cause is that the project config is not copied over.

Expected Result

The repo type should be taken over, either by copying parts of the project config or probably by storing the repo type elsewhere.

How to Reproduce

1. osc branch devel:openQA openQA
2. Observe that the project config is empty
3. Observe that the repository "containers" is built incorrectly, not as docker container anymore, most likely ending up in "unresolvable"

Further Information

#3788 is a related issue about the project config not copied.