Update dotnet-package.yml

Author: BattlefieldDuck

.github/workflows/dotnet-package.yml

@@ -8,19 +8,23 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
-        dotnet: ['6.0.x', '7.0.x', '8.0.x']
+        dotnet: [6, 7, 8, 9]
 
     steps:
       - uses: actions/checkout@v4
 
       - name: Setup .NET
         uses: actions/setup-dotnet@v4
+        id: setup-dotnet
         with:
           dotnet-version: ${{ matrix.dotnet }}
 
+      - name: Create temporary global.json
+        run: echo '{"sdk":{"version": "${{ steps.setup-dotnet.outputs.dotnet-version }}"}}' > ./global.json
+
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with: