add more actions

.github/workflows/phpstan.yml

@@ -0,0 +1,27 @@
+name: PHPStan
+
+on: [push, pull_request]
+
+jobs:
+  phpstan:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "8.2"
+
+      - name: Cache composer dependencies
+        uses: actions/cache@v4
+        with:
+          path: vendor
+          key: composer-${{ hashFiles('composer.lock') }}
+
+      - name: Run composer install
+        run: composer install -n --prefer-dist
+
+      - name: Run PHPStan
+        run: vendor/bin/phpstan analyse