Include PHPStan Installer

Author: michielgerritsen

magento/Dockerfile-2.4

@@ -44,7 +44,7 @@ RUN ./start-services && \
     php bin/magento indexer:reindex && \
     mkdir -p extensions && \
     composer config repositories.dev-extensions path extensions/* && \
-    composer require --dev phpstan/phpstan:~1.7 bitexpert/phpstan-magento && \
+    composer require --dev phpstan/phpstan bitexpert/phpstan-magento phpstan/extension-installer && \
     php scripts/apply-2.4-patches.php && \
     rm scripts/apply-2.4-patches.php && \
     rm scripts/downgrade-monolog.php && \

magento/scripts/allow-composer-plugins.php

@@ -4,6 +4,7 @@
     'captainhook/plugin-composer',
     'dealerdirect/phpcodesniffer-composer-installer',
     'laminas/laminas-dependency-plugin',
+    'phpstan/extension-installer',
     'magento/*',
 ];
 

magento/scripts/install-phpstan.php

@@ -22,7 +22,7 @@
 
 $output = null;
 $code = null;
-exec('composer require --dev phpstan/phpstan:~1.0 bitexpert/phpstan-magento', $output, $code);
+exec('composer require --dev phpstan/phpstan:~1.0 bitexpert/phpstan-magento phpstan/extension-installer', $output, $code);
 
 if ($code !== 0) {
     echo 'Unable to install PHPStan' . PHP_EOL;