Add PHPStan config and ci

Author: Prometee

.github/workflows/continuous-integration.yml

@@ -104,5 +104,8 @@ jobs:
           dependency-versions: "${{ matrix.dependency-versions }}"
           composer-options: "${{ matrix.composer-options }}"
 
+      - name: "Run PHPStan"
+        run: "vendor/bin/phpstan analyse --no-progress"
+
       - name: "Run PHPUnit"
         run: "composer test"

.gitignore

@@ -4,5 +4,6 @@
 /build/
 /composer.lock
 /phpspec.yml
+/phpstan.neon
 /phpunit.xml
 /vendor/