tools: add WPT updater for url subsystem

.github/workflows/update-wpt.yml

@@ -0,0 +1,62 @@
+name: WPT update
+
+on:
+  schedule:
+    # Run once a week at 12:00 AM UTC on Sunday.
+    - cron: 0 0 * * *
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  wpt-subsystem-update:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        subsystem:
+          - url
+
+    steps:
+      - uses: actions/checkout@v4@<hash>
+        with:
+          persist-credentials: false
+
+      - name: Update WPT for subsystem ${{ matrix.subsystem }}
+        run: |
+          git node wpt update --subsystem=${{ matrix.subsystem }}
+        env:
+          GH_USER_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Run WPT tests
+        run: |
+          git node wpt run --subsystem=${{ matrix.subsystem }}
+        env:
+          GH_USER_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Handle test failures and success
+        run: |
+          if [[ "$(git status --porcelain)" != "" ]]; then
+            git config --global user.name "${{ github.actor }}[bot]"
+            git config --global user.email "${{ github.actor }}@users.noreply.github.com"
+            git checkout -b actions/update-wpt-${{ matrix.subsystem }}
+            git add .
+            git commit -m "test: update WPT for ${{ matrix.subsystem }} to ${{ env.NEW_VERSION }}"
+            gh auth setup-git
+            git push origin actions/update-wpt-${{ matrix.subsystem }} -fu --no-verify
+            echo "createPR=true" >> "$GITHUB_OUTPUT"
+          else
+            echo "No changes to commit."
+          fi
+        env:
+          GH_USER_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Open a PR for the subsystem update
+        if: steps.push-changes.outputs.createPR
+        continue-on-error: true
+        run: |
+          gh pr create --head actions/update-wpt-${{ matrix.subsystem }} \
+          --title "test: update WPT for ${{ matrix.subsystem }} to ${{ env.NEW_VERSION }}" \
+          --body "This is an automated update of the WPT for ${{ matrix.subsystem }} to ${{ env.NEW_VERSION }}."
+        env:
+          GH_USER_TOKEN: ${{ secrets.GITHUB_TOKEN }}