chore: add dependabot config and automerge

Author: TonyRL

.github/dependabot.yml

@@ -0,0 +1,17 @@
+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: '/'
+    schedule:
+      interval: daily
+    open-pull-requests-limit: 10
+    labels:
+      - dependencies
+
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: daily
+    open-pull-requests-limit: 10
+    labels:
+      - dependencies

.github/workflows/ci.yml

@@ -0,0 +1,43 @@
+name: CI
+on:
+  push:
+    branches: ['main']
+  pull_request:
+    branches: ['main']
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Install pnpm
+        uses: pnpm/action-setup@v3
+        with:
+          version: 8
+      - name: Use Node.js Active LTS
+        uses: actions/setup-node@v4
+        with:
+          node-version: lts/*
+          cache: 'pnpm'
+      - name: Install dependencies
+        run: pnpm i
+      - name: Build docs
+        run: pnpm run docs:build
+
+  automerge:
+    if: github.triggering_actor == 'dependabot[bot]' && github.event_name == 'pull_request'
+    needs: build
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      contents: write
+    steps:
+      - uses: fastify/github-action-merge-dependabot@v3
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          target: minor