fix: preserve running kernel cache during archive updates

src/Kernel.php

@@ -8,4 +8,17 @@ use Symfony\Component\HttpKernel\Kernel as BaseKernel;
 class Kernel extends BaseKernel
 {
     use MicroKernelTrait;
+
+    private ?string $releaseCacheDir = null;
+
+    public function getCacheDir(): string
+    {
+        // A web update still needs its compiled services until the response has finished.
+        // The next release builds its own cache without deleting the running request's files.
+        return $this->releaseCacheDir ??= parent::getCacheDir().'/release-'.substr(
+            hash_file('sha256', $this->getProjectDir().'/VERSION'),
+            0,
+            16,
+        );
+    }
 }