DAOS-623 ci: Avoid Jenkins build for Dependabot PR [WIP]

[grom72]

DAOS-623 ci: Avoid Jenkins build for Dependabot PR

Doc-only: true

There is no need to start any action on Jenkins for Dependabot PRs.

An example of proposed result is here:
grom72@5cfa1c0

Before requesting gatekeeper:

• Two review approvals and any prior change requests have been resolved.
• Testing is complete and all tests passed or there is a reason documented in the PR why it should be force landed and forced-landing tag is set.
• Features: (or Test-tag*) commit pragma was used or there is a reason documented that there are no appropriate tags for this PR.
• Commit messages follows the guidelines outlined here.
• Any tests skipped by the ticket being addressed have been run and passed in the PR.

Gatekeeper:

• You are the appropriate gatekeeper to be landing the patch.
• The PR has 2 reviews by people familiar with the code, including appropriate owners.
• Githooks were used. If not, request that user install them and check copyright dates.
• Checkpatch issues are resolved. Pay particular attention to ones that will show up on future PRs.
• All builds have passed. Check non-required builds for any new compiler warnings.
• Sufficient testing is done. Check feature pragmas and test tags and that tests skipped for the ticket are run and now pass with the changes.
• If applicable, the PR has addressed any potential version compatibility issues.
• Check the target branch. If it is master branch, should the PR go to a feature branch? If it is a release branch, does it have merge approval in the JIRA ticket.
• Extra checks if forced landing is requested
  • Review comments are sufficiently resolved, particularly by prior reviewers that requested changes.
  • No new NLT or valgrind warnings. Check the classic view.
  • Quick-build or Quick-functional is not used.
• Fix the commit message upon landing. Check the standard here. Edit it to create a single commit. If necessary, ask submitter for a new summary.

[github-actions]

Ticket title is 'Generic ticket for minor code cleanup and improvement'
Status is 'Resolved'
Labels: 'request_for_2.6.3'
https://daosio.atlassian.net/browse/DAOS-623

[daltonbohning]

I think this adds to the commit title, not the message body. It probably will technically work, but the commit title and PR title will always be "Doc-only: true"

[grom72]

Yes, but this is the only way to force Jenkins not to build anything that is GHA-only related.
The dependabot can not modify commit message, it only knows how to adjust header.
PR title is usually modified manually later when jira ticket is created.
This mechanism is only to block the Jenkins build when such PR is created by dependabot.

[daltonbohning]

That's unfortunate. I think let's go with this for now.
But FWIW, the logic that auto determines Test-tag (not mapped to the entire code base yet) could also be adapted for this.
I.e. here

daos/ci/gen_commit_pragmas.py

Lines 87 to 93 in 2530707

	modified_files = git_files_changed(target)
	if not modified_files:
	return pragmas
	test_tag = ' '.join(sorted(tags.files_to_tags(modified_files)))
	if test_tag:
	pragmas['Test-tag'] = test_tag

Could have logic to implement "only GHA was modified so skip jenkins stages"