Github Actions: Add Phpstan

.github/workflows/php.yml

@@ -32,6 +32,10 @@ jobs:
 
       - name: Setup dependencies
         run: composer require -n --no-progress overtrue/phplint
+          && git clone --single-branch -b master https://github.com/Icinga/icingaweb2.git vendor/icingaweb2
+          && git clone --single-branch -b master https://github.com/Icinga/icingaweb2-module-director.git vendor/director
+          && git clone --single-branch -b snapshot/nightly https://github.com/Icinga/icinga-php-library.git vendor/icinga-php-library
+          && git clone --single-branch -b snapshot/nightly https://github.com/Icinga/icinga-php-thirdparty.git vendor/icinga-php-thirdparty
 
       - name: PHP Lint
         if: success() || matrix.allow_failure
@@ -40,3 +44,7 @@ jobs:
       - name: PHP CodeSniffer
         if: success() || matrix.allow_failure
         run: phpcs
+
+      - name: PHPStan
+        uses: php-actions/phpstan@v3
+        if: success() || matrix.allow_failure

phpstan.neon

@@ -0,0 +1,19 @@
+parameters:
+    level: 5
+
+    checkFunctionNameCase: true
+    checkMissingIterableValueType: true
+    checkInternalClassCaseSensitivity: true
+    checkDynamicProperties: true
+
+    paths:
+        - application
+        - library
+
+    scanDirectories:
+        - vendor
+
+    universalObjectCratesClasses:
+        - ipl\Orm\Model
+        - Icinga\Web\View
+        - Icinga\Data\ConfigObject