ci: 在 CI 工作流中创建本地 artifacts 目录

在 dotnet-pack 和 nuget-publish 工作流中添加步骤，确保构建前 `.\dotnet\artifacts` 目录存在。这可以防止因目标目录不存在而导致的潜在构建或发布错误。

Author: ichichchch

.github/workflows/dotnet-pack.yml

@@ -17,6 +17,9 @@ jobs:
       - uses: actions/setup-dotnet@v4
         with:
           dotnet-version: "10.0.x"
+      - name: Prepare local artifacts source
+        shell: pwsh
+        run: New-Item -ItemType Directory -Force -Path .\dotnet\artifacts | Out-Null
       - name: Restore
         run: dotnet restore .\dotnet\DeepSeek.OCR2.sln
       - name: Build

.github/workflows/nuget-publish.yml

@@ -16,6 +16,9 @@ jobs:
       - uses: actions/setup-dotnet@v4
         with:
           dotnet-version: "10.0.x"
+      - name: Prepare local artifacts source
+        shell: pwsh
+        run: New-Item -ItemType Directory -Force -Path .\dotnet\artifacts | Out-Null
       - name: Restore
         run: dotnet restore .\dotnet\DeepSeek.OCR2.sln
       - name: Build