Cache Doctrine metadata via opcache using DoctrineCacheBridge

config.yml

framework:
    cache:
        pools:
            app.cache.doctrine_metadata:
                adapter: cache.adapter.php_files

doctrine:
    orm:
        entity_managers:
            default:
                metadata_cache_driver:
                    type: service
                    id: app.cache.metadata_cache

services.xml

<service id="app.cache.metadata_cache" class="Cache\Bridge\DoctrineCacheBridge">
    <argument type="service" id="app.cache.doctrine_metadata" />
</service>

<service id="cache.adapter.php_files" class="Symfony\Component\Cache\Adapter\PhpFilesAdapter" abstract="true">
    <tag name="cache.pool" clearer="cache.default_clearer" />
    <tag name="monolog.logger" channel="cache" />
    <argument /> <!-- namespace -->
    <argument>0</argument> <!-- default lifetime -->
    <argument>%kernel.cache_dir%/pools</argument>
    <call method="setLogger">
        <argument type="service" id="logger" on-invalid="ignore" />
    </call>
</service>