test

.github/workflows/preview.yml

@@ -53,6 +53,7 @@ jobs:
           echo "CURRENT_SHA=$(git rev-parse HEAD)" >> $GITHUB_ENV
           prev_commit_count=$(echo "${{ steps.last_release.outputs.tag_name }}" | sed -e "s/^r//")
           commit_count_diff=$(expr ${{ env.COMMIT_COUNT }} - $prev_commit_count)
+          [ $commit_count_diff != 0 ] || exit 1
           commit_count_diff_plus_one=$(expr $commit_count_diff + 1)
           prev_release_sha=$(git log --topo-order -n $commit_count_diff --skip $commit_count_diff --max-count 1 --pretty=format:"%H")
           echo "PREV_RELEASE_SHA=$prev_release_sha" >> $GITHUB_ENV