Add CI workflow

Author: ruudk

.github/workflows/ci.yml

@@ -0,0 +1,44 @@
+name: CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        php-version:
+            - '8.4'
+            - '8.5'
+
+    name: PHP ${{ matrix.php-version }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-version }}
+
+      - name: Validate composer.json and composer.lock
+        run: composer validate --strict
+
+      - name: Install Composer dependencies
+        uses: "ramsey/composer-install@v3"
+
+      - name: Check composer.json normalization
+        run: composer normalize --diff --dry-run
+
+      - name: Check README examples are in sync
+        run: |
+          vendor/bin/readme-examples-sync
+          git diff --exit-code README.md || (echo "README.md is out of sync with example files. Run 'vendor/bin/readme-examples-sync' and commit the changes." && exit 1)
+
+      - name: Run PHP CS Fixer
+        run: vendor/bin/php-cs-fixer check --diff