build: add a revert workflow (#5680)

.github/workflows/revert.yaml

+name: Release
+on:
+  # manual trigger
+  workflow_dispatch:
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ./.github/actions/setup
+      - run: yarn prepare
+      - run: yarn build
+
+      - name: Setup node@16 (required by Cloudflare Pages)
+        uses: actions/setup-node@v3
+        with:
+          node-version: 16
+
+      - name: Update Cloudflare Pages deployment
+        uses: cloudflare/pages-action@364c7ca09a4b57837c5967871d64a2c31adb8c0d
+        with:
+          apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+          accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
+          projectName: ${{ secrets.CLOUDFLARE_PROJECT_NAME }}
+          directory: build
+          githubToken: ${{ secrets.GITHUB_TOKEN }}