Add read permission check for .env

app/Providers/RuntimeCheckServiceProvider.php

@@ -37,6 +37,10 @@ class RuntimeCheckServiceProvider extends ServiceProvider
             throw new PrettyPageException(trans('setup.file.no-dot-env'), -1);
         }
 
+        if (! is_readable(app()->environmentFile())) {
+            throw new PrettyPageException(trans('setup.file.dot-env-no-read-permission'), -1);
+        }
+
         // Check permissions of storage path
         if (! is_writable(storage_path())) {
             throw new PrettyPageException(trans('setup.permissions.storage'), -1);

resources/lang/en/setup.yml

@@ -6,6 +6,7 @@ database:
 file:
   permission-error: Unable to create textures folder, please check the directory permissions or place one manually.
   no-dot-env: Unable to find environment configuration file. Please rename .env.example to .env (please refer to setup manual).
+  dot-env-no-read-permission: Unable to read .env configuration file. Please check the file permission.
 
 permissions:
   storage: Unable to write to storage directory, please check the permissions.

resources/lang/zh_CN/setup.yml

@@ -6,6 +6,7 @@ database:
 file:
   permission-error: textures 文件夹创建失败，请确认目录权限是否正确，或者手动放置一个。
   no-dot-env: 找不到配置文件，请将 .env.example 重命名至 .env 并仔细阅读安装指南。
+  dot-env-no-read-permission: 无法读取 .env 配置文件，请检查文件权限。
 
 permissions:
   storage: 无法写入 storage 目录，请检查目录权限是否正确