Merge branch '7.4' into 8.0

* 7.4:
  [FrameworkBundle] Change HttpCache directory to use new getShareDir
  [Runtime] Expose `project_dir` as `APP_PROJECT_DIR` env var

Author: nicolas-grekas

HttpCache/HttpCache.php

@@ -83,6 +83,6 @@ protected function createSurrogate(): SurrogateInterface
 
     protected function createStore(): StoreInterface
     {
-        return $this->store ?? new Store($this->cacheDir ?: $this->kernel->getCacheDir().'/http_cache');
+        return $this->store ?? new Store($this->cacheDir ?: $this->kernel->getShareDir().'/http_cache');
     }
 }

Resources/config/services.php

@@ -115,7 +115,7 @@ class_exists(WorkflowEvents::class) ? WorkflowEvents::ALIASES : []
 
         ->set('http_cache.store', Store::class)
             ->args([
-                param('kernel.cache_dir').'/http_cache',
+                param('kernel.share_dir').'/http_cache',
             ])
         ->alias(StoreInterface::class, 'http_cache.store')