Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: rwmcguir

.github/workflows/build-multi.yml

@@ -35,6 +35,7 @@ jobs:
         echo ${{ secrets.GITHUB_TOKEN }} |
         docker login -u sys-lzdev --password-stdin ghcr.io
     - name: List available base images
+      if: github.event_name == 'workflow_dispatch'
       run: |
         for distro in ubuntu sles rhel; do
           echo "=== ${distro} ==="