jenkins: start CI run on new pull requests

[maclover7]

This will start a CI build on all new pull requests in nodejs/node, that
are opened by project collaborators

cc @joyeecheung

[refack]

FYI I just installed a plugin that can do the triggering (and also parse comments).
https://wiki.jenkins.io/display/JENKINS/GitHub+pull+request+builder+plugin

Still need the bot to communicate back.

P.S. Adding notification hook, or polling the repo does not require elevated authorization.

[refack]

I got our Jankins to do similar stuff
nodejs/node#17330
I just need a token (or proxy it through the bot)

[devsnek]

is there a way we can disable this? sometimes people open WIP prs where running a ci would just be a waste

[maclover7]

@refack Interesting! Personally, I prefer having the code live inside of a repo somewhere, so we avoid the black box of Jenkins plugins

[maclover7]

@devsnek I don't believe so -- this purposely only runs node-test-pull-request-lite so it shouldn't take up many resources. Also, it only runs when PRs are first opened, so at worst it would only be one build that is automatically triggered

[refack]

The Jenkins plugin has a label "blacklist" so PR with the WIP label should be skipped

[Trott]

If we could get this to post a CI: <URL here> comment, that would rule.

[Trott]

Oh, I see that was attempted but ran into tech diff...