create global.json in yml

Author: mikeebowen

.github/workflows/dotnet.yml

@@ -30,8 +30,11 @@ jobs:
       - uses: actions/checkout@v4
       - name: Setup DotNet ${{ matrix.dotnet-version }} Environment
         uses: actions/setup-dotnet@v4
+        id: setup-dotnet
         with:
           dotnet-version: ${{ matrix.dotnet-version }}
+      - name: Create temporary global.json
+        run: echo '{"sdk":{"version": "${{ steps.setup-dotnet.outputs.dotnet-version }}"}}' > ./global.json
       - name: Install dependencies
         run: dotnet restore
       - name: Build