docs: bot to trigger update-docs on merge to main

.github/workflows/update-docs-on-main.yml

@@ -0,0 +1,45 @@
+name: Update API Docs
+
+on:
+  push:
+    branches: main
+  workflow_dispatch:
+    # allows triggering from the gihub UI
+jobs:
+  check-for-doc-changes:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 20
+          cache: npm
+      - uses: google/wireit@setup-github-actions-caching/v1
+
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Update Docs
+        run: npm run update-docs
+
+      - name: Check if update-docs produces git diff
+        id: ifChange
+        run: git diff --exit-code || echo "::set-output name=changed::yes"
+
+      - name: Create PR
+        if: steps.ifChange.outputs.changed == 'yes'
+        uses: peter-evans/create-pull-request@v5
+        with:
+          # TODO: update to lit robot when it has access to repo
+          token: ${{ secrets.TEDIUM_BOT_GITHUB_ACCESS_TOKEN }}
+          commit-message: 'docs: update API docs'
+          author: tedium-bot <[email protected]>
+          committer: tedium-bot <[email protected]>
+          title: 'docs: update API docs'
+          body: This PR was auto generated by the update-docs-on-main GitHub action.
+          reviewers: e111077,asyncliz,AndrewJakubowicz
+          branch: auto-update-docs
+          labels: |
+            Ready for Google
+            preview-catalog