chore: create update submodules action (#140)

.github/workflows/update-submodules.yml

@@ -0,0 +1,28 @@
+name: Update submodules
+
+on:
+  schedule:
+    - cron: "0 0 * * *"
+  workflow_dispatch:
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
+
+      - name: Pull & update submodules recursively
+        run: |
+          git submodule update --init --recursive
+          git submodule update --recursive --remote
+
+      - name: Commit & push changes
+        run: |
+          git config --global user.name github-actions
+          git config --global user.email github-actions@github.com
+          git commit -am "Update submodules"
+          git push