modify workflow to run the tag generation only in main branch

.github/workflows/build-publish-jenkins-image.yaml

@@ -23,6 +23,7 @@ jobs:
         run: echo "JOB_START_TIME=$(date -u +"%d %B %A %Y %H:%M UTC")" >> $GITHUB_ENV
 
       - name: Git config and create new tag
+        if: github.ref == 'refs/heads/main' # Run only on main branch
         run: |
           # Run bash script to get new tag
           bash get_latest_version_create_tag.sh