Add extension template with PHPStan, PHPUnit and phpcs

.github/workflows/phpcs.yml

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+name: PHP_CodeSniffer
+
+on:
+  pull_request:
+    paths:
+      - '**.php'
+      - tools/phpcs/composer.json
+      - phpcs.xml.dist
+
+jobs:
+  phpcs:
+    runs-on: ubuntu-latest
+    name: PHP_CodeSniffer
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: 8.1
+        coverage: none
+        tools: cs2pr
+      env:
+        fail-fast: true
+
+    - name: Get composer cache directory
+      id: composer-cache
+      run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+    - name: Cache dependencies
+      uses: actions/cache@v3
+      with:
+        path: ${{ steps.composer-cache.outputs.dir }}
+        key: ${{ runner.os }}-composer-${{ hashFiles('tools/phpcs/composer.json') }}
+        restore-keys: ${{ runner.os }}-composer-
+
+    - name: Install dependencies
+      run: composer composer-phpcs -- update --no-progress --prefer-dist
+
+    - name: Run PHP_CodeSniffer
+      run: composer phpcs -- -q --report=checkstyle | cs2pr

.github/workflows/phpstan.yml

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+name: PHPStan
+
+on:
+  pull_request:
+    paths:
+      - '**.php'
+      - composer.json
+      - tools/phpstan/composer.json
+      - ci/composer.json
+      - phpstan.ci.neon
+      - phpstan.neon.dist
+
+jobs:
+  phpstan:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-versions: ['7.4', '8.0', '8.1']
+        prefer: ['prefer-stable', 'prefer-lowest']
+    name: PHPStan with PHP ${{ matrix.php-versions }} ${{ matrix.prefer }}
+
+    steps:
+    - uses: actions/checkout@v3
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php-versions }}
+        coverage: none
+      env:
+        fail-fast: true
+
+    - name: Get composer cache directory
+      id: composer-cache
+      run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+    - name: Cache dependencies
+      uses: actions/cache@v3
+      with:
+        path: ${{ steps.composer-cache.outputs.dir }}
+        key: ${{ runner.os }}-composer-${{ matrix.prefer }}-${{ hashFiles('**/composer.json') }}
+        restore-keys: ${{ runner.os }}-composer-${{ matrix.prefer }}-
+
+    - name: Install dependencies
+      run: |
+        composer update --no-progress --prefer-dist --${{ matrix.prefer }} &&
+        composer composer-phpunit -- update --no-progress --prefer-dist &&
+        composer composer-phpstan -- update --no-progress --prefer-dist --optimize-autoloader &&
+        composer --working-dir=ci update --no-progress --prefer-dist --${{ matrix.prefer }} --optimize-autoloader --ignore-platform-req=ext-gd
+
+    - name: Run PHPStan
+      run: composer phpstan -- analyse -c phpstan.ci.neon

.github/workflows/phpunit.yml

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+name: PHPUnit
+
+on:
+  pull_request:
+    paths:
+      - '**.php'
+      - composer.json
+      - tools/phpunit/composer.json
+      - phpunit.xml.dist
+      - tests/docker-prepare.sh
+
+env:
+  # On github CI machine creating the "/vendor" volume fails otherwise with: read-only file system: unknown
+  BIND_VOLUME_PERMISSIONS: rw
+
+jobs:
+  phpunit:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        civicrm-image-tags: [ '5-drupal-php8.1', '5-drupal-php7.4', '5.56-drupal-php7.4' ]
+    name: PHPUnit with Docker image michaelmcandrew/civicrm:${{ matrix.civicrm-image-tags }}
+    env:
+      CIVICRM_IMAGE_TAG: ${{ matrix.civicrm-image-tags }}
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Pull images
+      run: docker compose -f tests/docker-compose.yml pull --quiet
+    - name: Start containers
+      run: docker compose -f tests/docker-compose.yml up -d
+    - name: Prepare environment
+      run: docker compose -f tests/docker-compose.yml exec civicrm sites/default/files/civicrm/ext/de.systopia.twingle/tests/docker-prepare.sh
+    - name: Run PHPUnit
+      run: docker compose -f tests/docker-compose.yml exec civicrm sites/default/files/civicrm/ext/de.systopia.twingle/tests/docker-phpunit.sh
+    - name: Remove containers
+      run: docker compose -f tests/docker-compose.yml down -v