Fix range for cherry-pick in merge check workflow

Author: clsti

.github/workflows/public_merge_check.yml

@@ -35,9 +35,9 @@ jobs:
           LAST=$(git log origin/main..public/${{ github.ref_name }} --grep='Publish repository' --format='%H' | head -n1)
 
           if [ -n "$LAST" ]; then
-            RANGE="$LAST..public/main"
+            RANGE="$LAST..public/${{ github.ref_name }}"
           else
-            RANGE="origin/main..public/main"
+            RANGE="origin/main..public/${{ github.ref_name }}"
           fi
           if git rev-list --count $RANGE | grep -qv '^0$'; then
             git cherry-pick $RANGE