Add PHPStan and coding standards to CI

- Add PHPStan static analysis job
- Add PHPCS coding standards job
- Both jobs allow failure with || true for now

Author: dereuromark

.github/workflows/ci.yml

@@ -8,9 +8,10 @@ on:
 
 jobs:
   syntax-check:
-    name: PHP Syntax Check
+    name: PHP ${{ matrix.php-version }} Syntax
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
         php-version: ['8.2', '8.3', '8.4']
 
@@ -27,7 +28,29 @@ jobs:
         run: composer install --prefer-dist --no-progress
 
       - name: Check PHP syntax
-        run: find src -name "*.php" -exec php -l {} \;
+        run: |
+          find src -name "*.php" -exec php -l {} \;
+          php -l wp-djot.php
+          php -l uninstall.php
+
+  static-analysis:
+    name: PHPStan
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.2'
+          tools: composer:v2, phpstan
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress
+
+      - name: Run PHPStan
+        run: phpstan analyse --configuration=phpstan.neon || true
 
   coding-standards:
     name: Coding Standards