enigne/skin: don't use $globalContext to build cache dir path

src/engine/skin/BaseSkin.php

@@ -17,9 +17,9 @@ abstract class BaseSkin
     protected \Twig\Environment $twig;
 
     public function __construct() {
-        global $config, $globalContext;
+        global $config;
 
-        $cache_dir = $config['skin_cache_'.(isDev() ? 'dev' : 'prod').'_dir'].'/'.$globalContext->project;
+        $cache_dir = $this->getCacheDir();
         if (!file_exists($cache_dir)) {
             if (mkdir($cache_dir, $config['dirs_mode'], true))
                 setperm($cache_dir);
@@ -35,6 +35,7 @@ abstract class BaseSkin
     }
 
     abstract protected function getTwigLoader(): LoaderInterface;
+    abstract protected function getCacheDir(): string;
 
     public function set($arg1, $arg2 = null) {
         if (is_array($arg1)) {

src/engine/skin/ErrorSkin.php

@@ -14,6 +14,11 @@ class ErrorSkin
         return new FilesystemLoader(self::TEMPLATES_ROOT, APP_ROOT);
     }
 
+    protected function getCacheDir(): string {
+        global $config;
+        return $config['skin_cache_'.(isDev() ? 'dev' : 'prod').'_dir'].'/error';
+    }
+
     public function renderNotFound(): never {
         global $globalContext;
         if (isset($globalContext->project) && file_exists(self::TEMPLATES_ROOT.'/notfound_'.$globalContext->project.'.twig'))

src/lib/foreignone/ForeignOneSkin.php

@@ -37,6 +37,11 @@ class ForeignOneSkin
         return $twig_loader;
     }
 
+    protected function getCacheDir(): string {
+        global $config;
+        return $config['skin_cache_'.(isDev() ? 'dev' : 'prod').'_dir'].'/foreignone';
+    }
+
     public function renderPage(string $template, array $vars = []): Response {
         $this->exportStrings(['4in1']);
         $this->applyGlobals();

src/lib/ic/InvisibleCollegeSkin.php

@@ -22,6 +22,11 @@ class InvisibleCollegeSkin
         return $twig_loader;
     }
 
+    protected function getCacheDir(): string {
+        global $config;
+        return $config['skin_cache_'.(isDev() ? 'dev' : 'prod').'_dir'].'/ic';
+    }
+
     /*
     public function renderPage(string $template, array $vars = []): Response {
         $this->exportStrings(['4in1']);