Add runs-on field to Spotless Check step in CI (#3400) (#3401)

Signed-off-by: rithin-pullela-aws <rithinp@amazon.com>
(cherry picked from commit 48379ad)

Co-authored-by: Rithin Pullela <rithinp@amazon.com>

Author: opensearch-trigger-bot[bot]

.github/workflows/CI-workflow.yml

@@ -23,6 +23,8 @@ jobs:
       product: opensearch
 
   spotless:
+    if: github.repository == 'opensearch-project/ml-commons'
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       # Spotless requires JDK 17+