Add GitHub action test workflow

.github/workflows/tests.yml

@@ -0,0 +1,36 @@
+name: Tests
+
+on: [push, pull_request]
+
+jobs:
+  tests:
+    name: Tests PHP ${{ matrix.php }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        php: [7.4, 8.0, 8.1, 8.2, 8.3]
+        include:
+          - php: 8.2
+            analysis: true
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up PHP ${{ matrix.php }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          coverage: xdebug
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress
+
+      - name: Coding standards
+        if: matrix.analysis
+        run: vendor/bin/phpcs
+
+      - name: Tests
+        run: vendor/bin/phpunit --coverage-clover clover.xml
+