Use poll env when checking for ls-remote branches.

[timbrown5]

The core issue is that params are not resolved until the start of the build (i.e. not valid in the Polling context).

The git ls-remote code-path uses an empty env when checking for branches - which means params in a branch spec don't get resolved.
I have updated the code to use the pollEnv variable when evaluating these params - as these .

Some additional background - we have tried the workaround of setting 'Force workspace when polling'. This seems to fix the issue for permanent nodes, but we use a lot of EC2 nodes where it breaks once the node that last ran a job gets culled.

Checklist

• I have read the CONTRIBUTING doc
• I have referenced the Jira issue related to my changes in one or more commit messages
• I have added tests that verify my changes
• Unit tests pass locally with my changes
• I have added documentation as necessary
• No Javadoc warnings were introduced with my changes
• No spotbugs warnings were introduced with my changes
• Documentation in README has been updated as necessary
• Online help has been added and reviewed for any new or modified fields
• I have interactively tested my changes
• Any dependent changes have been merged and published in upstream modules (like git-client-plugin)

Types of changes

• Bug fix (non-breaking change which fixes an issue)

[timbrown5]

Is there any update on this?

[MarkEWaite]

Is there any update on this?

Sorry for the delay @timbrown5 . I'll try to review it within the next 2-4 weeks. Changing the polling process has a number of areas where I need to be especially to not change (regress) existing behavior.