fix startup bug (#426)

CHANGELOG.md

@@ -4,6 +4,8 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
+### Fixed
+- Fix startup bug for linux/docker installations without a `/dev/dri` folder
 
 ## [0.1.2-alpha] - 2021-10-12
 ### Added

ErsatzTV/Services/RunOnce/PlatformSettingsService.cs

@@ -1,5 +1,4 @@
-using System.Collections.Generic;
-using System.Linq;
+using System.Linq;
 using System.Runtime.InteropServices;
 using System.Threading;
 using System.Threading.Tasks;
@@ -40,8 +39,9 @@ namespace ErsatzTV.Services.RunOnce
                 IConfigElementRepository repo = scope.ServiceProvider.GetRequiredService<IConfigElementRepository>();
                 await repo.Upsert(ConfigElementKey.FFmpegSaveReports, false);
             }
-            
-            if (runtimeInfo != null && runtimeInfo.IsOSPlatform(OSPlatform.Linux))
+
+            if (runtimeInfo != null && runtimeInfo.IsOSPlatform(OSPlatform.Linux) &&
+                System.IO.Directory.Exists("/dev/dri"))
             {
                 ILocalFileSystem localFileSystem = scope.ServiceProvider.GetRequiredService<ILocalFileSystem>();
                 IMemoryCache memoryCache = scope.ServiceProvider.GetRequiredService<IMemoryCache>();