ci: print base ref commit after fetch

Author: stempler

.github/workflows/tf-autosquash.yml

@@ -88,6 +88,8 @@ jobs:
           echo "Current commit:"
           git log -1 --oneline
           git fetch origin
+          echo "Base ref commit:"
+          git log -1 --oneline "origin/$BASE_REF"
           git rebase -i --autosquash "origin/$BASE_REF"
 
       - name: Push changes