Prevent generating a kernel_secret file in the standalone image if it already exists or is defined through an environment variable

Author: codedmonkey

tests/Docker/Standalone/InitTest.php

@@ -49,7 +49,13 @@ public function testKernelSecretNotRegeneratedOnRestart(): void
 
         $initialSecret = $this->filesystem->readFile(__DIR__ . '/config/secrets/kernel_secret');
 
-        $this->container->restart();
+        $this->container->stop();
+
+        $this->container = (new GenericContainer('dirigent-standalone'))
+            ->withMount(__DIR__ . '/config', '/srv/config')
+            ->withMount(__DIR__ . '/scripts', '/srv/scripts/tests')
+            ->withWait(new WaitForLog('ready to handle connections'))
+            ->start();
 
         $this->assertContainerLogsContain('Kernel secret exists');