Add Volto Light Theme frontend CI workflow

.github/workflows/volto-light-theme.yml

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+name: Volto Light Theme
+
+on: [push, pull_request]
+
+jobs:
+  volto-light-theme:
+    if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
+    runs-on: ubuntu-latest
+    name: Volto Light Theme
+    timeout-minutes: 45
+    strategy:
+      fail-fast: false
+      matrix:
+        node-version: [24.x]
+    env:
+      project-directory: volto-light-theme
+    steps:
+      - name: Checkout Volto Light Theme (main)
+        uses: actions/checkout@v5
+        with:
+          repository: kitconcept/volto-light-theme
+          ref: main
+          path: ${{ env.project-directory }}
+
+      - name: Set up pnpm
+        uses: pnpm/action-setup@v6
+        with:
+          package_json_file: ${{ env.project-directory }}/frontend/package.json
+          cache: true
+          cache_dependency_path: ${{ env.project-directory }}/frontend/pnpm-lock.yaml
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Install Volto Light Theme frontend
+        working-directory: ${{ env.project-directory }}/frontend
+        # Same `make install` steps, but fetch the Volto branch from the push
+        # into the `core` folder before installing the dependencies.
+        run: |
+          pnpm dlx mrs-developer missdev --no-config --fetch-https
+          (cd core && git fetch --depth 1 origin "${GITHUB_REF}" && git checkout FETCH_HEAD)
+          pnpm i --no-frozen-lockfile
+          make build-deps
+
+      - name: Running lint works
+        working-directory: ${{ env.project-directory }}/frontend
+        run: make lint
+
+      - name: Build Storybook
+        working-directory: ${{ env.project-directory }}/frontend
+        run: make storybook-build
+
+      - name: Run i18n tests
+        working-directory: ${{ env.project-directory }}/frontend
+        run: make i18n
+
+      - name: Running tests works
+        working-directory: ${{ env.project-directory }}/frontend
+        run: make ci-test

packages/volto/news/+volto-light-theme-ci.internal

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+Added a CI workflow that runs the Volto Light Theme frontend test suite against the Volto branch from the push, replacing the `core` folder with the pushed Volto branch. @wesleybl