Add debugging dump option to Jenkins

[cachedout]

What does this PR do?

Why is it important?

This allows for easier debugging of Jenkins errors by providing an option to dump certain environment variables to the console.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works

Author's Checklist

• [ ]

Related issues

[kuisathaverat]

I'd call the method dumpFilteredEnvironment inside those tho functions to show the env vars before to execute a target

https://github.com/elastic/beats/blob/d2b4cc4c9cf183a642df55035e8cb53665370337/Jenkinsfile#L549-L572

[andrewkroh]

You might also want to work in a call to mage dumpVariables if you think it fits in to what your doing.

[kuisathaverat]

You might also want to work in a call to mage dumpVariables if you think it fits in to what your doing.

yep that looks more accurate

[cachedout]

You might also want to work in a call to mage dumpVariables if you think it fits in to what your doing.

In-addition-to or in-place-of what's there now?

[cachedout]

@kuisathaverat OK, this is ready for another round of review. Thanks!

[cachedout]

jenkins, run the tests please

[cachedout]

@andrewkroh Looks like this has some unrelated failures. Could you give it a review and let me know if you think it's safe to merge?

[andrewkroh]

LGTM

[cachedout]

Merging after verifying it is OK with the Beats team.

[kuisathaverat]

it has a syntax issue

11:19:44  GitHub has been notified of this commit’s build result
11:19:44  
11:19:44  org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
11:19:44  WorkflowScript: 532: unexpected token: } @ line 532, column 1.
11:19:44     }
11:19:44     ^

[cachedout]

Shoot! Probably on L45. Are you putting up a PR or shall I do it?

[kuisathaverat]

#16975