Github Actions: Add Phpstan

.github/workflows/php.yml

@@ -32,6 +32,9 @@ jobs:
 
       - name: Setup dependencies
         run: composer require -n --no-progress overtrue/phplint
+          && git clone --single-branch --branch master https://github.com/Icinga/icingaweb2.git vendor/icingaweb2
+          && git clone --single-branch --branch snapshot/nightly https://github.com/Icinga/icinga-php-library.git vendor/icinga-php-library
+          && git clone --single-branch --branch snapshot/nightly https://github.com/Icinga/icinga-php-thirdparty.git vendor/icinga-php-thirdparty
 
       - name: PHP Lint
         if: success() || matrix.allow_failure
@@ -40,3 +43,7 @@ jobs:
       - name: PHP CodeSniffer
         if: success() || matrix.allow_failure
         run: phpcs -wps --colors
+
+      - name: PHPStan
+        uses: php-actions/phpstan@v3
+        if: success() || matrix.allow_failure

phpstan.neon

@@ -0,0 +1,9 @@
+parameters:
+    level: 1
+    paths:
+        - application
+        - library
+    scanDirectories:
+        - vendor
+    ignoreErrors:
+        - '#Unsafe usage of new static\(\)#'