Please enable github-checks-plugin

Here it is mentioned that we can have warnings published to github: https://github.com/jenkinsci/warnings-ng-plugin/blob/master/doc/Documentation.md#warnings-checks-for-github-projects

As discussed here: https://github.com/eclipse-platform/.github/discussions/21 we want to use that to better keep track of warnings.

This requires the following plugin on jenkins: https://github.com/jenkinsci/github-checks-plugin

and an authentication as a git-app (probably already done?) https://github.com/jenkinsci/github-branch-source-plugin/blob/master/docs/github-app.adoc

I'd like to use Equinox Jenkins as an incubator for this feature, so I'd like to ask to enable this at least for that instance and link it to github.

FYI @akurtakov