Kernel.php

<?php

namespace App;

use Symfony\Bundle\FrameworkBundle\Kernel\MicroKernelTrait;
use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
use Symfony\Component\HttpKernel\Kernel as BaseKernel;
use Symfony\Component\Routing\Loader\Configurator\RoutingConfigurator;

class Kernel extends BaseKernel
{
    use MicroKernelTrait;

    protected function configureContainer(ContainerConfigurator $container): void
    {
        $container->import('../config/{packages}/*.yaml');
        $container->import('../config/{packages}/'.$this->environment.'/*.yaml');

        if (is_file(\dirname(__DIR__).'/config/services.yaml')) {
            $container->import('../config/{services}.yaml');
            $container->import('../config/{services}_'.$this->environment.'.yaml');
        } elseif (is_file($path = \dirname(__DIR__).'/config/services.php')) {
            (require $path)($container->withPath($path), $this);
        }
    }

    protected function configureRoutes(RoutingConfigurator $routes): void
    {
        $routes->import('../config/{routes}/'.$this->environment.'/*.yaml');
        $routes->import('../config/{routes}/*.yaml');

        if (is_file(\dirname(__DIR__).'/config/routes.yaml')) {
            $routes->import('../config/{routes}.yaml');
        } elseif (is_file($path = \dirname(__DIR__).'/config/routes.php')) {
            (require $path)($routes->withPath($path), $this);
        }
    }
}

phpmd.xml

<?xml version="1.0"?>
<ruleset name="IndienEssen ruleset"
         xmlns="http://pmd.sf.net/ruleset/1.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://pmd.sf.net/ruleset/1.0.0 http://pmd.sf.net/ruleset_xml_schema.xsd"
         xsi:noNamespaceSchemaLocation="http://pmd.sf.net/ruleset_xml_schema.xsd">
    <description>
        Ruleset for IndienEssen modules
    </description>
    <rule ref="rulesets/cleancode.xml">
        <exclude name="StaticAccess"/>
        <exclude name="ElseExpression"/>
        <exclude name="MissingImport"/>
    </rule>
    <rule ref="rulesets/codesize.xml">
        <exclude name="TooManyFields"/>
    </rule>
    <rule ref="rulesets/controversial.xml">
        <exclude name="Superglobals"/>
    </rule>
    <rule ref="rulesets/design.xml">
        <exclude name="ExitExpression"/>
        <exclude name="CouplingBetweenObjects" />
    </rule>
    <rule ref="rulesets/design.xml/CouplingBetweenObjects">
        <properties>
            <property name="maximum" value="20"/>
        </properties>
    </rule>
    <rule ref="rulesets/naming.xml">
        <exclude name="LongVariable"/>
        <exclude name="ShortVariable"/>
    </rule>
    <rule ref="rulesets/unusedcode.xml">
        <exclude name="UnusedFormalParameter"/>
    </rule>
    <exclude-pattern>src/Migrations/*</exclude-pattern>
</ruleset>