Add a link to the flakey test dev guide.

Signed-off-by: Daniel (dB.) Doubrovkine <[email protected]>

.github/workflows/gradle-check.yml

@@ -91,3 +91,6 @@ jobs:
               * **RESULT:** ${{ env.result }} :x:
               * **URL:** ${{ env.workflow_url }}
               * **CommitID:** ${{ env.pr_from_sha }}
+              Please examine the workflow log, locate, and copy-paste the failure below.
+              [Flakey test?](https://github.com/opensearch-project/OpenSearch/blob/main/DEVELOPER_GUIDE.md#flakey-tests)
+              Iterate to green.

CHANGELOG.md

@@ -36,6 +36,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Add groupId value propagation tests for ZIP publication task ([#4772](https://github.com/opensearch-project/OpenSearch/pull/4772))
 - Add support for GeoJson Point type in GeoPoint field ([#4597](https://github.com/opensearch-project/OpenSearch/pull/4597))
 - Add dev guide for dealing with flakey tests ([4868](https://github.com/opensearch-project/OpenSearch/pull/4868))
+- Add dev help in gradle check CI failures ([4872](https://github.com/opensearch-project/OpenSearch/pull/4872))
 
 ### Dependencies
 - Bumps `log4j-core` from 2.18.0 to 2.19.0