ci: add browserlist update action

.github/workflows/browserlist-update.yml

@@ -0,0 +1,35 @@
+name: Update Browserslist database
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 2 1 * *'
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  update-browserslist-database:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - name: Configure git
+        run: |
+          # Setup for commiting using built-in token. See https://github.com/actions/checkout#push-a-commit-using-the-built-in-token
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+      - name: Update Browserslist database and create PR if applies
+        uses: c2corg/browserslist-update-action@v2
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          branch: browserslist-update
+          base_branch: master
+          directory: ./komga-webui
+          commit_message: 'build(webui): update Browserslist db'
+          title: 'Browserslist database update'
+          body: Auto-generated by [browserslist-update-action](https://github.com/c2corg/browserslist-update-action/)
+          labels: 'github_actions'