Add extracted code from project

.gitattributes

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+Tests export-ignore
+patches export-ignore
+.github export-ignore
+
+.gitattributes export-ignore
+.gitignore export-ignore
+
+.php-cs-fixer.dist.php export-ignore
+phpstan.neon export-ignore
+phpunit.xml.dist export-ignore
+
+shell.nix export-ignore

.github/workflows/ci.yaml

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+name: CI
+on:
+  - pull_request
+jobs:
+  check-composer:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Validate composer.json
+        run: composer validate
+
+  php-linting:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-version:
+          - 8.1
+          - 8.2
+          - 8.3
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "${{ matrix.php-version }}"
+          tools: composer:v2
+
+      - name: PHP lint
+        run: "find *.php Classes Configuration Tests -name '*.php' -print0 | xargs -0 -n 1 -P 4 php -l"
+
+  xml-linting:
+    runs-on: ubuntu-latest
+    needs: [check-composer]
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "8.2"
+          tools: composer:v2
+
+      - name: Install xmllint
+        run: sudo apt-get install libxml2-utils
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress --no-suggest
+
+      - name: PHPUnit configuration file
+        run: xmllint --schema vendor/phpunit/phpunit/phpunit.xsd --noout phpunit.xml.dist
+
+  coding-guideline:
+    runs-on: ubuntu-latest
+    needs:
+      - php-linting
+      - xml-linting
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "8.2"
+          tools: composer:v2
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress --no-suggest
+
+      - name: Coding Guideline
+        run: ./vendor/bin/php-cs-fixer fix --dry-run --diff
+
+  code-quality:
+    runs-on: ubuntu-latest
+    needs:
+      - php-linting
+    strategy:
+      matrix:
+        include:
+          - php-version: '8.1'
+            typo3-version: '^12.4'
+          - php-version: '8.2'
+            typo3-version: '^12.4'
+          - php-version: '8.3'
+            typo3-version: '^12.4'
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "${{ matrix.php-version }}"
+          tools: composer:v2
+
+      - name: Install dependencies with expected TYPO3 version
+        run: |-
+          composer require --no-interaction --prefer-dist --no-progress "typo3/cms-core:${{ matrix.typo3-version }}" "typo3/cms-extbase:${{ matrix.typo3-version }}" "typo3/cms-frontend:${{ matrix.typo3-version }}" "typo3/cms-fluid-styled-content:${{ matrix.typo3-version }}"
+
+      - name: Code Quality (by PHPStan)
+        run: ./vendor/bin/phpstan analyse

.gitignore

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+/composer.lock
+/.php-cs-fixer.cache
+/.Build/
+/public/
+/vendor/