Add workflow for auto-updating submodules

.github/workflows/auto_update_submodule.yml

diff --git a/.github/workflows/auto_update_submodule.yml b/.github/workflows/auto_update_submodule.yml
new file mode 100644
index 0000000..7219ddf
--- /dev/null
+++ b/.github/workflows/auto_update_submodule.yml
@@ -0,0 +1,41 @@
+    
+name: 'Auto-update Submodules'
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "0 0 * * *"
+
+jobs:
+  sync:
+    name: 'Auto-update Submodules'
+    runs-on: ubuntu-latest
+
+    # Use the Bash shell regardless whether the GitHub Actions runner is ubuntu-latest, macos-latest, or windows-latest
+    defaults:
+      run:
+        shell: bash
+
+    steps:
+    # Checkout the repository to the GitHub Actions runner
+    - name: Checkout
+      uses: actions/checkout@v2
+      with:
+        submodules: true
+    
+    # Git config
+    - name: Git Configurations
+      run: |
+        git config --global user.name 'Git bot'
+        git config --global user.email 'bot@noreply.github.com'
+        
+    # Update references
+    - name: Git Sumbodule Update
+      run: |
+        git submodule update --init --recursive
+        git submodule update --remote --recursive
+
+    - name: Commit update
+      run: |
+        git remote set-url origin https://x-access-token:${{ secrets.GITHUB_TOKEN }}@github.com/${{ github.repository }}
+        git commit -am "Auto updated submodule references" && git push || echo "No changes to commit"