Use OBS built container as CI base to provide all dependencies

[okurz]

No description provided.

[Martchus]

see comments in #141

[okurz]

I am trying to define a container within git, check that out in OBS, build it there and reuse from there.

Did

osc copypac devel:openQA:ci base devel:openQA:ci openqa-trigger-from-obs

and adapted
https://build.opensuse.org/package/view_file/devel:openQA:ci/openqa-trigger-from-obs/_service?expand=1
but this won't work because we do not have "python3-black" in devel:openQA:ci

So instead I created a new subproject https://build.opensuse.org/project/show/devel:openQA:openqa-trigger-from-obs and moved the package there https://build.opensuse.org/package/show/devel:openQA:openqa-trigger-from-obs/openqa-trigger-from-obs

I copied and adjusted the config for building container images from devel:openQA.

Then I did

osc linkpac openSUSE:Factory python-black devel:openQA:openqa-trigger-from-obs

and python3-black is correctly built but the container does not find it: https://build.opensuse.org/package/show/devel:openQA:openqa-trigger-from-obs/openqa-trigger-from-obs

[okurz]

Updated to use Tumbleweed as base so that we don't need to care to bump the OS version number. Adjusting the OBS service project accordingly

[okurz]

All done. After merge I would setup the github-OBS webhook connection to automatically trigger the dependency container build on every change in this repo