[ADD] map runbot's warn result to gitlab's success_with_warnings

[hbrunn]

@moylop260 so this was my naive approach to implement the warnings. Didn't work, and I was convinced to do something stupid, until I looked this up at the gitlab side:
https://gitlab.com/gitlab-org/gitlab-ce/blob/master/lib/api/commit_statuses.rb#L98

So next step is to check if it's just as simple as adding the warning status there, but my ruby is not really existing. Any pointers are appreciated.

[moylop260]

Did you mean create a new PR to gitlab-ci in order to support this case?

[hbrunn]

yes. but first i have to get familiar with ruby in order to provide a meaningful mr there. that's then more a pet project of mine and will stay in 'work in progress' quite a while. or i will propose to make warning succeed with an amendment that there were warnings. that would be great for my workflow with colleagues - what do you think?

[moylop260]

Yes, if the CIs support a middle status like as runbot (yellow result) is a meaningful for us too.

FYI I requested the same for travis-ci:

• [FEATURE REQUEST] Add yellow state for warnings travis-ci/travis-ci#4730

[hbrunn]

I fear the gitlab people won't be much more forthcoming... For my own purposes, succeeding with a different name or different description already would suffice, how about just doing this instead?

[hbrunn]

superseded by #180 as I don't think the api will be extended any time soon