fix: Jenkins multibranch

[sgtcoolguy]

This is a follow-on to #165

greenkeeper-lockfile-upload will ignore gitURL and use repoSlug when using the env.GH_TOKEN (see https://github.com/greenkeeperio/greenkeeper-lockfile/blob/master/upload.js#L47-L48). I did not attempt to fix that, but instead overhauled the jenkins CI impl to provide both gitURL and repoSlug.

I also tweaked it to be much more exhaustive in attempting to get the git URL (and therefore the slug) by consulting, in order:

• env.CHANGE_TARGET - used by Jenkins multibranch builds.
• env.GIT_URL - used by old Jenkins plugins.
• calling out to git config remote.origin.url
• Trying the repository/repository.url value from package.json.

[patkub]

@sgtcoolguy Travis build fails because of code format. Run standard --fix and commit changes to resolve.

[janl]

@sgtcoolguy heya, overall this looks great. Can you look at the test errors reported by Travis?

[sgtcoolguy]

@janl ok, I think I fixed the issue now. Needed to update the test setup/snapshot to handle/expect a call to git config remote.origin.url (actually twice in the monorepo root package case)

[janl]

perfect, thanks!

[greenkeeperio-bot]

:tada: This PR is included in version 2.3.2 :tada:

The release is available on:

• npm package (@next dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: