So, I've already had to abandon multibranch pipelines because they don't get the gitlab variables that I need for my build. Now, I'm working on a regular pipeline and it doesn't have access to the global BRANCH variable.

So, I can't do pleasant stage conditions like this

when {
    branch 'master'
}

I have to write gnarlier conditions

when {
    environment name: 'gitlabBranch', value: 'master'
}