Update build.yml matrix dotnet8

Signed-off-by: Henrique Graca <[email protected]>

.github/workflows/build.yml

@@ -13,13 +13,17 @@ defaults:
 jobs:
   build:
     runs-on: ubuntu-latest
-
+    strategy:
+      matrix:
+        dotnet: [ '6.0.405', '8.0.101' ]
     steps:
       - uses: actions/checkout@v3
-      - name: Setup .NET 6.0
+      - name: Setup .NET ${{ matrix.dotnet }}
         uses: actions/setup-dotnet@607fce577a46308457984d59e4954e075820f10a
         with:
-          dotnet-version: 6.0.405
+          dotnet-version: ${{ matrix.dotnet }}
+      - name: Create temporary global.json
+        run: echo '{"sdk":{"version": "${{ steps.stepid.outputs.dotnet-version }}"}}' > ./global.json
       - name: Install solution dependencies
         run: dotnet restore
       - name: Build