chore: add auto-update workflow for dependencies

Author: stephanebouget

.github/workflows/auto-update.yml

@@ -0,0 +1,59 @@
+name: Auto-update dependencies
+
+on:
+  schedule:
+    # Every day at 02:00 UTC
+    - cron: '0 2 * * *'
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  update-dependencies:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out Git repository
+        uses: actions/checkout@v4
+
+      - name: Install Node.js and Yarn
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: yarn install
+        run: yarn install
+
+      - name: Update dependencies
+        run: |
+          npm install -g npm-check-updates
+          ncu -u --target minor
+          yarn install
+
+      - name: Create Pull Request
+        id: create-pr
+        uses: peter-evans/create-pull-request@v5
+        with:
+          token: ${{ secrets.PAT_TOKEN }}
+          commit-message: 'chore: update dependencies'
+          title: 'chore: update dependencies'
+          body: |
+            Automated dependency update.
+
+            This PR updates all dependencies in `package.json` and `yarn.lock`.
+
+            Please review and merge if all checks pass.
+          branch: chore/update-dependencies
+          delete-branch: true
+
+      - name: Enable auto-merge
+        if: steps.create-pr.outputs.pull-request-number
+        run: |
+          gh pr merge ${{ steps.create-pr.outputs.pull-request-number }} \
+            --auto \
+            --squash \
+            --delete-branch
+        env:
+          GH_TOKEN: ${{ secrets.PAT_TOKEN }}