Adde scheduled workflow (#9)

## what
- Update workflows (`.github/workflows/`) to use
`cloudposse-github-actions` org workflows

## why
- Part of migration GHA to `cloudposse-github-actions` org

Author: goruha

.github/workflows/scheduled.yml

@@ -0,0 +1,16 @@
+---
+name: scheduled
+on:
+  workflow_dispatch: { }  # Allows manually trigger this workflow
+  schedule:
+    - cron: "0 3 * * *"
+
+permissions:
+  pull-requests: write
+  id-token: write
+  contents: write
+
+jobs:
+  scheduled:
+    uses: cloudposse-github-actions/.github/.github/workflows/shared-scheduled.yml@main
+    secrets: inherit