[fix] Cannot update suhmodule

.github/workflows/update-submodule.yml

@@ -1,9 +1,9 @@
-name: Update Submodules
+name: (U) 🧰 Update Submodules
 
 on:
     workflow_dispatch:
     schedule:
-      - cron: "0 15 * * *"
+      - cron: "0 16 * * *"
 
 jobs:
   update-submodules:
@@ -13,10 +13,21 @@ jobs:
       uses: actions/checkout@v2
       with:
         submodules: "recursive"
+
+    - name: configure git
+      run: |
+        git config --global user.name "github-actions[bot]"
+        git config --global user.email "41898282+github-actions[bot]@users.noreply.github.com"
     
     - name: Update Submodules
       run: |
-        git submodule update --init --recursive
+        git submodule update --remote
         git add .
-        git commit -m "Update submodules"
+
+        if git diff-index --quiet HEAD --; then
+          echo "No submodule changes; exiting."
+          exit 0
+        fi
+
+        git commit -m "[FB bot] Update submodules" -a
         git push