add daily chore to update submodules

.github/workflows/update-submodules.yml

@@ -0,0 +1,70 @@
+name: Update Submodules
+
+on:
+  schedule:
+    # Run every night at 2 AM UTC
+    - cron: '0 2 * * *'
+  workflow_dispatch:  # Allow manual trigger
+
+jobs:
+  update-submodules:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          submodules: true
+          fetch-depth: 0
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Configure git
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+
+      - name: Update submodules to latest
+        id: update
+        run: |
+          # Update all submodules to their latest remote commits
+          git submodule update --remote --init --recursive
+
+          # Check if there are any changes
+          if git diff --quiet; then
+            echo "has_changes=false" >> "$GITHUB_OUTPUT"
+            echo "No submodule updates found"
+          else
+            echo "has_changes=true" >> "$GITHUB_OUTPUT"
+            echo "Submodule updates found:"
+            git diff --submodule=short
+
+            # Capture the diff for the PR body
+            {
+              echo "diff<<DIFF_EOF"
+              git diff --submodule=short
+              echo "DIFF_EOF"
+            } >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Create Pull Request
+        if: steps.update.outputs.has_changes == 'true'
+        uses: peter-evans/create-pull-request@v6
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: "chore: update submodules"
+          title: "chore: Update submodules"
+          body: |
+            This PR updates submodules to their latest commits.
+
+            **Updated submodules:**
+            ```
+            ${{ steps.update.outputs.diff || 'See commit for details' }}
+            ```
+
+            ---
+            *This PR was automatically created by the update-submodules workflow.*
+          branch: automated/update-submodules
+          delete-branch: true
+          labels: |
+            automated
+            dependencies