Merge branch '6.4' into 7.3

* 6.4:
  remove deprecated nullable option from primary key columns
  specific fix to avoid 'outag' when inflecting 'outages'
  [Process] Enhance hasSystemCallBeenInterrupted function for non-english locale
  [FrameworkBundle] Make `cache:warmup` warm up read-only caches

Author: nicolas-grekas

Command/CacheWarmupCommand.php

@@ -69,9 +69,10 @@ protected function execute(InputInterface $input, OutputInterface $output): int
             $kernel->warmUp($cacheDir);
         }
 
-        $preload = $this->cacheWarmer->warmUp($cacheDir);
-
         $buildDir = $kernel->getContainer()->getParameter('kernel.build_dir');
+
+        $preload = $this->cacheWarmer->warmUp($cacheDir, $buildDir);
+
         if ($preload && $cacheDir === $buildDir && file_exists($preloadFile = $buildDir.'/'.$kernel->getContainer()->getParameter('kernel.container_class').'.preload.php')) {
             Preloader::append($preloadFile, $preload);
         }