When I have a manual step in my pipeline such as asking for a build number to promote, I want to see a popup where the user would enter a string rather than seeing just a 'Play' button. 

The input could be in the form of:
build_id = input id: 'Seurat_build_id', message: 'Build version?', parameters: [string(defaultValue: '1.0.0', description: '', name: 'build_id')]