Add bucket directory listing as parameter

[craigdbarber]

Please, add posibility to choose directory (or file) as build parameter from configured bucket/s. This feature is like from Git plugin, which lists branches to build from.

[craigdbarber]

Migrated from: https://issues.jenkins-ci.org/browse/JENKINS-49824

[stephenashank]

The directory can be specified in the Storage Location field for uploads, and in the Object to Download field for download steps, including specifying patterns. I think the feature requested is a list of files/directories separate from the bucket name, similar to the git plugin, instead of creating multiple build steps.