chore(workflow): another try

.gitea/workflows/dotnet.yml

@@ -19,22 +19,10 @@ jobs:
         with:
           dotnet-version: 8.0.x
 
-      # 华为云和腾讯云的 NuGet 镜像配置
-      - name: Configure NuGet mirror
-        run: |
-          cat > nuget.config << 'EOF'
-          <?xml version="1.0" encoding="utf-8"?>
-          <configuration>
-            <packageSources>
-              <clear />
-              <add key="huawei-mirror" value="https://repo.huaweicloud.com/repository/nuget/v3/index.json" />
-              <add key="tencent" value="https://mirrors.cloud.tencent.com/nuget/" />
-            </packageSources>
-          </configuration>
-          EOF
-
       - name: Restore dependencies
         run: dotnet restore
+        env:
+          DOTNET_RESTORE_SOURCES: "https://repo.huaweicloud.com/repository/nuget/v3/index.json"
       
       - name: Build
         run: dotnet build --no-restore --configuration Release