MUL-246 - adds migration for cms plugin, updates installation config

doc/installation.md

@@ -89,7 +89,6 @@ you will probably need to change the extension of the imported file in
 
 ```
 $ bin/console cache:clear
-$ bin/console doctrine:migrations:diff
 $ bin/console doctrine:migrations:migrate
 $ bin/console assets:install --symlink
 $ bin/console sylius:theme:assets:install --symlink

src/DependencyInjection/BitBagSyliusCmsExtension.php

@@ -10,12 +10,36 @@
 
 namespace BitBag\SyliusCmsPlugin\DependencyInjection;
 
+use Sylius\Bundle\CoreBundle\DependencyInjection\PrependDoctrineMigrationsTrait;
 use Symfony\Component\DependencyInjection\ContainerBuilder;
 use Symfony\Component\DependencyInjection\Extension\Extension;
+use Symfony\Component\DependencyInjection\Extension\PrependExtensionInterface;
 
-final class BitBagSyliusCmsExtension extends Extension
+final class BitBagSyliusCmsExtension extends Extension implements PrependExtensionInterface
 {
+    use PrependDoctrineMigrationsTrait;
+
     public function load(array $configs, ContainerBuilder $container): void
     {
     }
+
+    public function prepend(ContainerBuilder $container): void
+    {
+        $this->prependDoctrineMigrations($container);
+    }
+
+    protected function getMigrationsNamespace(): string
+    {
+        return 'BitBag\SyliusCmsPlugin\Migrations';
+    }
+
+    protected function getMigrationsDirectory(): string
+    {
+        return '@BitBagSyliusCmsPlugin/Migrations';
+    }
+
+    protected function getNamespacesOfMigrationsExecutedBefore(): array
+    {
+        return ['Sylius\Bundle\CoreBundle\Migrations'];
+    }
 }