Add check workflow for PR testing (#8)

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Max Prilutskiy <maks.prilutskiy@gmail.com>

Author: devin-ai-integration[bot]

.github/workflows/check.yml

@@ -0,0 +1,32 @@
+name: PHP SDK Tests
+
+on:
+  pull_request_target:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.1'
+          extensions: mbstring, intl
+          coverage: none
+          tools: composer:v2
+
+      - name: Validate composer.json
+        run: composer validate --strict
+
+      - name: Install dependencies
+        run: composer install --prefer-dist
+
+      - name: Run tests
+        run: vendor/bin/phpunit tests/