tools: add skeleton for automate time zone update

Fixes: nodejs#43134

.github/workflows/timezone-update.yml

@@ -0,0 +1,29 @@
+name: Timezone update
+on:
+  schedule:
+    # Run once a week at 00:05 AM UTC on Sunday.
+    - cron: 5 0 * * 0
+
+  workflow_dispatch:
+
+jobs:
+  authors_update:
+    if: github.repository == 'nodejs/node'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          fetch-depth: '0'  # This is required to actually get all the authors
+          persist-credentials: false
+      - run: tools/update-timezone.js  # Run the timezone tool
+      - uses: gr2m/create-or-update-pull-request-action@v1  # Create a PR or update the Action's existing PR
+        env:
+          GITHUB_TOKEN: ${{ secrets.GH_USER_TOKEN }}
+        with:
+          author: Node.js GitHub Bot <github-bot@iojs.org>
+          body: >
+            updates the ICU files
+          branch: actions/timezone-update  # Custom branch *just* for this Action.
+          commit-message: 'meta: update timezone'
+          labels: meta
+          title: 'meta: update timezone'

tools/update-timezone.mjs

@@ -0,0 +1,5 @@
+#!/usr/bin/env node
+// Usage: tools/update-timezone.mjs [--dry]
+// Passing --dry will redirect output to stdout.
+
+console.log('Initial Skeleton');