Add Github Actions to run tests

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+name: CI Tests
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        # https://www.php.net/supported-versions.php
+        php-version: ['8.3']
+
+    name: Level0 tests
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up PHP ${{ matrix.php-version }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+          coverage: none
+
+      - name: Install dependencies
+        run: composer install --no-progress --no-suggest --no-interaction
+
+      - name: Run tests
+        run: |
+          composer validate
+          ./vendor/bin/phpunit --display-warnings test/