ci: Add Dependabot dependency updates

Author: YasharF

.github/dependabot.yml

@@ -0,0 +1,30 @@
+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: '/'
+    schedule:
+      interval: 'weekly'
+      day: 'thursday'
+    target-branch: 'master'
+    open-pull-requests-limit: 3
+    versioning-strategy: increase
+    commit-message:
+      prefix: 'chore'
+      include: 'scope'
+    groups:
+      major-updates:
+        update-types: ['major']
+      minor-updates:
+        update-types: ['minor']
+      patch-updates:
+        update-types: ['patch']
+
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: 'monthly'
+    target-branch: 'master'
+    open-pull-requests-limit: 3
+    commit-message:
+      prefix: 'chore'
+      include: 'scope'

.github/workflows/build.yml

@@ -0,0 +1,47 @@
+name: Node.js CI
+
+on:
+  push:
+    branches: ['master']
+  pull_request:
+    branches: ['master']
+
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [22.x]
+    steps:
+      - uses: actions/checkout@v5
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: 'npm'
+      - run: npm install
+      - run: npm run lint-check
+      - run: npm run test
+
+  dependabot-automerge:
+    needs: [build]
+    if: >
+      github.event_name == 'pull_request' &&
+      github.event.pull_request.user.login == 'dependabot[bot]'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+      - name: Automerge Dependabot PRs if all checks have passed
+        shell: bash
+        env:
+          GH_TOKEN: ${{ github.token }}
+        run: |
+          gh pr merge --squash ${{ github.event.pull_request.number }}