Add Pull Request deployment workflow

.github/workflows/build.yml

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+name: Build Website
+
+on:
+  workflow_call:
+    inputs:
+      ref:
+        required: true
+        type: string
+      repo:
+        required: true
+        type: string
+      lang:
+        required: true
+        type: string
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          repository: ${{ inputs.repo }}
+          ref: ${{ inputs.ref }}
+          persist-credentials: 'false'
+
+      - uses: actions/download-artifact@v4
+        with:
+          path: modules
+
+      - run: |
+          rmdir modules/mkdocs-material
+          mv modules/mkdocs-material-insiders modules/mkdocs-material
+          rmdir theme/assets/brand
+          mv modules/brand theme/assets/brand
+
+      - if: inputs.lang != 'en'
+        run: |
+          cp -rl modules/i18n/i18n .
+          cp -rl modules/i18n/includes .
+          cp -rl modules/i18n/theme .
+
+      - name: Python setup
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.8'
+          cache: 'pipenv'
+
+      - name: Cache files
+        uses: actions/[email protected]
+        with:
+          key: ${{ inputs.ref }}
+          path: .cache
+
+      - name: Install Python dependencies
+        run: |
+          pip install pipenv
+          pipenv install
+          sudo apt install pngquant
+
+      - name: Build website
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          CARDS: false
+          CONTEXT: deploy-preview
+          NETLIFY: true
+        run: |
+          pipenv run mkdocs build --config-file config/mkdocs.${{ inputs.lang }}.yml
+          cp -r static/* site/
+          pipenv run mkdocs --version
+          tar -czvf site-build-${{ inputs.lang }}.tar.gz site
+
+      - name: Upload tar.gz file
+        uses: actions/upload-artifact@v4
+        with:
+          name: site-build-${{ inputs.lang }}.tar.gz
+          path: site-build-${{ inputs.lang }}.tar.gz

.github/workflows/download-repo.yml

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+name: Download repository
+
+on:
+  workflow_call:
+    inputs:
+      repo:
+        required: true
+        type: string
+    secrets:
+      ACTIONS_SSH_KEY:
+        required: true
+
+jobs:
+  download:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          repository: 'privacyguides/${{ inputs.repo }}'
+          path: ${{ inputs.repo }}
+          ssh-key: ${{ secrets.ACTIONS_SSH_KEY }}
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: ${{ inputs.repo }}
+          path: ${{ inputs.repo }}
+          retention-days: 1

.github/workflows/preview-pr.yml

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+name: Build Pull Request Preview
+
+on:
+  pull_request_target:
+
+jobs:
+  downloadSubmodules:
+    strategy:
+      matrix:
+        repo: [mkdocs-material-insiders, brand, i18n]
+    uses: ./.github/workflows/download-repo.yml
+    with:
+      repo: ${{ matrix.repo }}
+    secrets:
+      ACTIONS_SSH_KEY: ${{ secrets.ACTIONS_SSH_KEY }}
+
+  build:
+    needs: downloadSubmodules
+    strategy:
+      matrix:
+        lang: [en, es, fr, he, it, nl, ru, zh-Hant]
+    permissions:
+      contents: read
+    uses: ./.github/workflows/build.yml
+    with:
+      ref: ${{github.event.pull_request.head.ref}}
+      repo: ${{github.event.pull_request.head.repo.full_name}}
+      lang: ${{ matrix.lang }}
+
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          pattern: site-build-*
+          merge-multiple: true
+
+      - run: |
+          tar -xvzf site-build-*
+          ls -la site/