feat: include new article titles in RSS update commit message

Co-authored-by: Mr-xn <[email protected]>

.github/workflows/rss_update.yml

@@ -38,4 +38,11 @@ jobs:
           git config --global user.name "github-actions[bot]"
           git config --global user.email "github-actions[bot]@users.noreply.github.com"
           git add README.md
-          git diff --quiet && git diff --staged --quiet || (git commit -m "docs: auto update RSS [skip ci]" && git push)
+
+          # 如果脚本未生成 commit message 文件，则使用默认值
+          if [ ! -f .commit_titles.txt ]; then
+            echo "docs: auto update RSS [skip ci]" > .commit_titles.txt
+          fi
+
+          git diff --quiet && git diff --staged --quiet || (git commit -F .commit_titles.txt && git push)
+          rm -f .commit_titles.txt