Auto-update gradle wrapper (#127)

.github/workflows/update-gradle-wrappers-daily.yml

@@ -0,0 +1,25 @@
+name: Update gradle wrappers (daily)
+
+on:
+  schedule:
+    # daily at 1:30 UTC
+    - cron: "30 1 * * *"
+  workflow_dispatch:
+
+jobs:
+  update-gradle-wrapper:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Update Gradle Wrapper
+        uses: gradle-update/update-gradle-wrapper-action@v1
+
+  workflow-notification:
+    needs:
+      - update-gradle-wrapper
+    if: always()
+    uses: ./.github/workflows/reusable-workflow-notification.yml
+    with:
+      success: ${{ needs.update-gradle-wrapper.result == 'success' }}