Global variables for Jenkins pipelines

Ever found yourself needing to be able to use the same variable over and over for many pipelines? Here’s how:

1. Make a vars/globals.groovy file in your shared library
2. Put this in it:

#!/usr/bin/env groovy
import groovy.transform.Field

@Field final String GITHUB_URL = 'https://github.com/'
@Field final String GITHUB_SLUG = 'k-caps'

3. Access the constant from your Jenkinsfiles:

repoUrl = globals.GITHUB_URL + globals.GITHUB_SLUG

You can access it from other files under vars the exact same way, too.