Add GitHub actions

Author: mpbzh

.github/workflows/ci.yml

@@ -0,0 +1,19 @@
+name: CI
+
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Setup PHP
+        id: setup-php
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.2'
+      - name: Install dependencies
+        run: composer install
+      - run: ./vendor/bin/php-cs-fixer check
+      - run: ./vendor/bin/phpstan
+      - run: ./vendor/bin/phpunit