Set up continuous integration with GitHub Actions

Author: nicwortel

.github/workflows/test.yaml

@@ -0,0 +1,32 @@
+name: CI
+
+on:
+  - push
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php:
+          - '8.3'
+          - '8.4'
+      fail-fast: false
+
+    steps:
+      - name: Checkout source code
+        uses: actions/checkout@v4
+
+      - name: Install PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+
+      - name: Install dependencies with Composer
+        uses: ramsey/composer-install@v3
+        with:
+          dependency-versions: ${{ matrix.dependencies }}
+
+      - name: Run PHPUnit tests
+        run: vendor/bin/phpunit