How to auto merge Git branches prior to a Jenkins build?

Question

How to auto merge Git branches prior to a Jenkins build?

I have 2 builds, one for branch master and one for production.

I would like to do Git merge <

Answer 1

You can do premerging via extensions block in pipelines (assuming you configured checkout: [ $class: 'GIT_SCM' ] already.)

[
        $class: "PreBuildMerge",
        options: [
            mergeTarget: "master",
            fastForwardMode: "FF",
            mergeRemote: "origin",
            mergeStrategy: "OURS"
        ]
]