Add GitHub Actions workflow for NuGet package build

Introduces a workflow to build, pack, and upload NuGet packages on release creation or push to master. The workflow sets up .NET 10, restores dependencies, builds the project, creates the package, and uploads it as an artifact.

Author: emako

.github/workflows/library.nuget.yml

@@ -0,0 +1,36 @@
+name: build
+
+on:
+  release:
+    types: [created]
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: windows-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 10.0.x
+
+      - name: Install dependencies
+        run: dotnet restore src\System.IO.Hashing.XxHash.csproj
+
+      - name: Build
+        run: dotnet build src\System.IO.Hashing.XxHash.csproj --configuration Release --no-restore
+
+      - name: Pack
+        run: dotnet pack src\System.IO.Hashing.XxHash.csproj -c Release --no-build -o out
+
+      - name: Push NuGet package
+        # run:  dotnet nuget push "out\*.nupkg" -k ${{secrets.NUGET_AUTH_TOKEN}} --source https://api.nuget.org/v3/index.json
+        uses: actions/upload-artifact@v4
+        with:
+          name: nuget-packages
+          path: out/*.nupkg